Multiple improvements to the data hub:

* Making registration finer-grained so we only listen to the data we really need.
* Moving the system listener registration to an external class (for testability and readability)
* Adding a unit test (not yet complete)
* Adding documention and cleaning up comments

Still many things TODO:
* Allow pausing of registrations
* Add pause/resume to onPause/onResume of activities
* Move sampling logic out of the hub
* Optimize data reloading when display preferences change
* (maybe) move the data hub and related classes to the "content" package

MyTracks/MyTracks.launch

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<launchConfiguration type="com.android.ide.eclipse.adt.debug.LaunchConfigType">
+<intAttribute key="com.android.ide.eclipse.adt.action" value="0"/>
+<stringAttribute key="com.android.ide.eclipse.adt.commandline" value=""/>
+<intAttribute key="com.android.ide.eclipse.adt.delay" value="0"/>
+<booleanAttribute key="com.android.ide.eclipse.adt.nobootanim" value="false"/>
+<intAttribute key="com.android.ide.eclipse.adt.speed" value="0"/>
+<booleanAttribute key="com.android.ide.eclipse.adt.target" value="false"/>
+<booleanAttribute key="com.android.ide.eclipse.adt.wipedata" value="false"/>
+<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS">
+<listEntry value="/MyTracks"/>
+<listEntry value="/MyTracks/AndroidManifest.xml"/>
+</listAttribute>
+<listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES">
+<listEntry value="4"/>
+<listEntry value="1"/>
+</listAttribute>
+<listAttribute key="org.eclipse.debug.ui.favoriteGroups">
+<listEntry value="org.eclipse.debug.ui.launchGroup.run"/>
+<listEntry value="org.eclipse.debug.ui.launchGroup.debug"/>
+</listAttribute>
+<booleanAttribute key="org.eclipse.jdt.launching.ALLOW_TERMINATE" value="true"/>
+<stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="MyTracks"/>
+</launchConfiguration>