Sensor batching, value accuracy tests, and cross-sensor tests.

Adding three new sensor tests and commented back in a Magnetometer test for value accuracy.
Adding a fourth new sensor test for batching.
Adding a fifth new sensor test for cross-sensor timestamp synchronization.
Renamed and refactored AccelerometerTestRenderer as GLArrowSensorTestRenderer for extended use.

Change-Id: I71c81f4a6f3ab572993d78dbf2ad932df4cd16f5

Conflicts:
	apps/CtsVerifier/AndroidManifest.xml
	apps/CtsVerifier/res/values/strings.xml