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.

Change-Id: Id0b13ba1092a1d6e0bf7bff5f14d89764cdf370c

Conflicts:
	packages/SystemUI/res/values/cm_strings.xml
Screenrecord: Create the Screenshots directory if it doesn't exist

Change-Id: I2b0458eed024dbda97e9e1ea3426c12d29add781
SystemUI: Add RECORD_AUDIO permission

Change-Id: I5af3cbe31f182c8b5cf1633aaf8a16db2856a425
SystemUI: Add missing sound permissions for screen recording

Change-Id: If948aabfd5c2e09f192f12aa02830d39346d2c6c
Screenrecord: Allow setting bitrate, screen size (1/2)

Also changes default output folder

Credits to 0xD34D

Change-Id: I33c7c296040345271560f72765e07f85cdefd805

Conflicts:
	packages/SystemUI/res/values/config.xml