Camera button support: useful features & bugfixes (2/2)

Screw the remapping, let's make something more useful!
Replaced the code to actually launch Camera app, not just fire the shutter.
I won't remove it: it's cool to have an option to double-click Home for Camera.
Added:
  * Camera wake (with button half-press) and unlock options
  * "Peek": releasing the half-pressed Camera button will
    turn the screen back off
  * Camera playback control

Change-Id: I711fe6b1a8d304b3d0ba9682a8757605992e1bde
(cherry picked from commit b7d39529c17894e66b692504f5f43170ad1efd58)

Conflicts:
	res/values/cm_strings.xml
	src/com/android/settings/SecuritySettings.java
	src/com/android/settings/cyanogenmod/ButtonSettings.java
Merge "Quiet Hours: allow disabling of system sounds (2 of 2)" into cm-10.2
(cherry picked from commit 30218ec93f1070e29b71837aa1816e57ede89496)