Settings: Slims ElectronBeam get some love (2/2)

Features:
- You can select different crt off animation modes if device overlay does not disable it at all
- disabled
- always horizontal (stock behaviour)
- always vertical (screen collapse from left and right to the middle)
- orientation dependent (means portrait = horizontal animation, landscape = vertical animation)
- some minor fixes/code style improvements to 4.3 implementation

Change-Id: I35fb277b8da823d50cc4db1eec32ea597fe973f2

 settings: add scale down crt animation - thanks a ton to xploidwild

really nice idea...fits perfectly into our animation options
for CRT

reword the different modes

Change-Id: I07a32b4cbfe956010507f5c8eddc92c2df395815