This fixes the following glitches:
- flash at the end of animation as the widget resets. Fix: new "hold" animation holds the view for 1 second, allowing it to transition before we reset the view.
- target flashing. Fix: remove AlphaAnimation when we want to hide the target.
- bar appears to get stuck at edge. Fix: sliding bar now slides fully offscreen when hold == true. Added setHoldAfterTrigger() method to allow InCallScreen and LockScreen to have different behaviors.
- view continues to animate when shown again. Fix: reset the animations and sliders when the view is hidden.
Tested:
Answer/Decline call on CDMA and GSM device.
Unlock phone and toggle sound on/off in LockScreen on both devices.
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