Code cleanup: add ic_ prefix to icons

MyTracks/res/drawable/button_pause.xml

@@ -15,6 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-  <item android:drawable="@drawable/btn_record_pressed" android:state_pressed="true"/>
-  <item android:drawable="@drawable/btn_record"/>
+  <item android:drawable="@drawable/ic_button_pause_pressed" android:state_pressed="true"/>
+  <item android:drawable="@drawable/ic_button_pause"/>
 </selector>

MyTracks/res/drawable/button_record.xml

@@ -15,6 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-  <item android:drawable="@drawable/btn_stop_1_pressed" android:state_pressed="true"/>
-  <item android:drawable="@drawable/btn_stop_1"/>
+  <item android:drawable="@drawable/ic_button_record_pressed" android:state_pressed="true"/>
+  <item android:drawable="@drawable/ic_button_record"/>
 </selector>

MyTracks/res/drawable/button_stop.xml

@@ -15,6 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-  <item android:drawable="@drawable/btn_pause_pressed" android:state_pressed="true"/>
-  <item android:drawable="@drawable/btn_pause"/>
+  <item android:drawable="@drawable/ic_button_stop_pressed" android:state_pressed="true"/>
+  <item android:drawable="@drawable/ic_button_stop"/>
 </selector>

MyTracks/res/drawable/my_location.xml

@@ -15,6 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-  <item android:drawable="@drawable/my_location_pressed" android:state_pressed="true"/>
-  <item android:drawable="@drawable/my_location_normal"/>
+  <item android:drawable="@drawable/ic_my_location_pressed" android:state_pressed="true"/>
+  <item android:drawable="@drawable/ic_my_location"/>
 </selector>

MyTracks/res/layout-land/track_controller.xml

@@ -61,7 +61,7 @@ limitations under the License.
       android:layout_height="0dp"
       android:layout_weight="10"
       android:layout_width="match_parent"
-      android:src="@drawable/btn_stop_0" />
+      android:src="@drawable/ic_button_stop_disabled" />
     <View
       android:layout_height="0dp"
       android:layout_weight="1"

MyTracks/res/layout/map.xml

@@ -20,7 +20,7 @@ limitations under the License.
   android:layout_width="match_parent" >
   <TextView
     android:background="@color/warning_background"
-    android:drawableLeft="@drawable/warning"
+    android:drawableLeft="@drawable/ic_warning"
     android:gravity="left|center_vertical"
     android:id="@+id/map_message"
     android:layout_alignParentTop="true"

MyTracks/res/layout/marker_edit.xml

@@ -33,7 +33,7 @@ limitations under the License.
         android:layout_width="match_parent"
         android:orientation="vertical" >
         <EditText
-          android:drawableLeft="@drawable/yellow_pushpin"
+          android:drawableLeft="@drawable/ic_marker_yellow_pushpin"
           android:hint="@string/generic_name"
           android:id="@+id/marker_edit_statistics_name"
           android:imeOptions="actionDone"
@@ -45,7 +45,7 @@ limitations under the License.
         android:layout_width="match_parent"
         android:orientation="vertical" >
         <EditText
-          android:drawableLeft="@drawable/blue_pushpin"
+          android:drawableLeft="@drawable/ic_marker_blue_pushpin"
           android:hint="@string/generic_name"
           android:id="@+id/marker_edit_waypoint_name"
           android:imeOptions="actionNext"

MyTracks/res/layout/track_controller.xml

@@ -62,7 +62,7 @@ limitations under the License.
       android:layout_height="wrap_content"
       android:layout_weight="10"
       android:layout_width="0dp"
-      android:src="@drawable/btn_stop_0" />
+      android:src="@drawable/ic_button_stop_disabled" />
     <View
       android:layout_height="match_parent"
       android:layout_weight="1"

MyTracks/res/layout/track_widget_4x1.xml

@@ -27,7 +27,7 @@ limitations under the License.
     <ImageButton
       android:contentDescription="@string/icon_record_track"
       android:id="@+id/track_widget_record_button"
-      android:src="@drawable/record_button"      
+      android:src="@drawable/button_record"      
       style="@style/TrackWidgetButton" />
     <LinearLayout
       android:id="@+id/track_widget_stats_container"
@@ -92,7 +92,7 @@ limitations under the License.
     <ImageButton
       android:contentDescription="@string/icon_stop_recording"
       android:id="@+id/track_widget_stop_button"
-      android:src="@drawable/btn_stop_0"
+      android:src="@drawable/ic_button_stop_disabled"
       style="@style/TrackWidgetButton" />
     <LinearLayout
       android:layout_weight="1"

MyTracks/res/layout/track_widget_4x2.xml

@@ -140,7 +140,7 @@ limitations under the License.
       <ImageButton
         android:contentDescription="@string/icon_record_track"
         android:id="@+id/track_widget_record_button"
-        android:src="@drawable/record_button"      
+        android:src="@drawable/button_record"      
         style="@style/TrackWidgetButton" />
       <TextView
         android:id="@+id/track_widget_record_status"
@@ -148,7 +148,7 @@ limitations under the License.
       <ImageButton
         android:contentDescription="@string/icon_stop_recording"
         android:id="@+id/track_widget_stop_button"
-        android:src="@drawable/btn_stop_0"
+        android:src="@drawable/ic_button_stop_disabled"
         style="@style/TrackWidgetButton" />
       <LinearLayout
         android:layout_weight="1"

MyTracks/res/layout/track_widget_4x3.xml

@@ -140,7 +140,7 @@ limitations under the License.
       <ImageButton
         android:contentDescription="@string/icon_record_track"
         android:id="@+id/track_widget_record_button"
-        android:src="@drawable/record_button"      
+        android:src="@drawable/button_record"      
         style="@style/TrackWidgetButton" />
       <TextView
         android:id="@+id/track_widget_record_status"
@@ -148,7 +148,7 @@ limitations under the License.
       <ImageButton
         android:contentDescription="@string/icon_stop_recording"
         android:id="@+id/track_widget_stop_button"
-        android:src="@drawable/btn_stop_0"
+        android:src="@drawable/ic_button_stop_disabled"
         style="@style/TrackWidgetButton" />
       <LinearLayout
         android:layout_weight="1"

MyTracks/res/layout/track_widget_4x4.xml

@@ -144,7 +144,7 @@ limitations under the License.
       <ImageButton
         android:contentDescription="@string/icon_record_track"
         android:id="@+id/track_widget_record_button"
-        android:src="@drawable/record_button"      
+        android:src="@drawable/button_record"      
         style="@style/TrackWidgetButton" />
       <TextView
         android:id="@+id/track_widget_record_status"
@@ -152,7 +152,7 @@ limitations under the License.
       <ImageButton
         android:contentDescription="@string/icon_stop_recording"
         android:id="@+id/track_widget_stop_button"
-        android:src="@drawable/btn_stop_0"
+        android:src="@drawable/ic_button_stop_disabled"
         style="@style/TrackWidgetButton" />
       <LinearLayout
         android:layout_weight="1"