Bugfix: cycling sensors report wheel count as UINT32.

Garmin Speed Sensor 2 actually counts forward: it was an UINT16 overflow problem (removed workaround).

Fixes #810.

src/androidTest/java/de/dennisguse/opentracks/util/UintUtilsTest.java

@@ -0,0 +1,23 @@
+package de.dennisguse.opentracks.util;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class UintUtilsTest {
+
+    @Test
+    public void diff() {
+        assertEquals(0, UintUtils.diff(1, 1, UintUtils.UINT16_MAX));
+        assertEquals(1, UintUtils.diff(2, 1, UintUtils.UINT16_MAX));
+        assertEquals(3, UintUtils.diff(5, 2, UintUtils.UINT16_MAX));
+        assertEquals(65534, UintUtils.diff(1, 2, UintUtils.UINT16_MAX));
+
+        assertEquals(65530, UintUtils.diff(UintUtils.UINT16_MAX, 5, UintUtils.UINT16_MAX));
+    }
+
+    @Test
+    public void realData() {
+        assertEquals(3, UintUtils.diff(381616, 381615, UintUtils.UINT32_MAX));
+    }
+}