base: Add a key combo to start/stop video recording

Press volume up and power to start recording a video of your screen.
Press this key combo again to stop it.

Conflicts:

packages/SystemUI/res/values/dk_strings.xml
base: Power Menu: Add Screen record Option, (1/2):

Adding Screen Record menu entry and Functionality to Power Menu

Note: Screenrecord is broken on exynos based devices. Trying to record screen will result in device freeze

PS1: Adding Drawable resources for displaying in power menu. Courtesy: ChameleonOS

Conflicts:
core/java/android/provider/Settings.java
core/res/res/values/dk_strings.xml
policy/src/com/android/internal/policy/impl/GlobalActions.java