TWRP-ify (Squashed commits)

Original author: Dees_Troy

Additional commits below: Tasssadar

Add TW_NO_SCREEN_BLANK := true

Use rgb565 framebuffer format

* A bit faster, since recovery has to copy half the amount of data

Change-Id: I5eadd957b44fc90b7bf78bfbfa58d831a12039af