settings:port advanced keyboard IME features (2/2)

credits: Slimroms
this commit adds:

- ime switcher notification - thanks cm
- slims fullscreen disable on landscape
- slims force autorotation on IME
- volume button control for navigate in the message - thanks cm
- slims force to show always enter key

Change-Id: I58596f11ee09c6db77119f3e3044e1ec2dd30c0a