Frameworks: SlimPie give user ability to reduce trigger heights if IME keyboard shows (1/2)

Add a user option to reduce left and right trigger of SlimPie if keyboard shows up
(especially usefull for swipe keyboard which most keyboards are nowadays). Enabled
by default user can disable it in settings.

Change-Id: I5dce4f36f5b14320f806ac60ad75931fa7f2873b

Patchset: 3
https://gerrit.slimroms.net/#/c/3502/