libaudioeffect_jni: GREF leak fix for JB

- Excessive JNI global reference in AudioEffects.
- Global references created during native setup
  are not deleted.
- Global references are deleted in setup failure
  and during native release.

(cherry picked from commit a04a2bf4563dc20c52f4d4239e01f80b220077a5)
CRs-fixed: 413633

Change-Id: Ia4340a2128850101b394e00c8e1db9db49f516fd
Allow setting a per-device default configuration for STATUS_BAR_BATTERY

Batteryless devices (like TV-connected mediacenters/STBs) don't need
the battery icon there at all.

Change-Id: Iac7e1b0b813c260bc78f4733409a30da7bda248d
Allow hardware overflow key to be show by default.

Currently this is controlled by a system setting, but there is no way to
set a default value for the system setting. This is very useful to have
for devices that have no hardware menu key.

Change-Id: I94212def19d3e2224d79d3a89e1e2d3b2883da21

Conflicts:
	packages/SettingsProvider/res/values/defaults.xml
	packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
SettingsProvider: Add a default for the dialer's autocomplete

... and flip it on

Change-Id: I9ff8d3fdb682292a89606856c8851b5eed197f06

Conflicts:
	packages/SettingsProvider/res/values/defaults.xml
	packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
Camera : Powerkey shutter (1/2)

Allows user to take use power key to take pictures/videos

Change-Id: I85a1e1761199f4604672be42a3a5005227f5451a