Frameworks: navigation bar IME cursor

Old idea from AOKP revamped for kk 4.4

- permanent option (not configurable) due it is very usefull
- left arrow single press = cursor left; longpress = cursor one line up; longpress hold = faster several lines up
- right arrow same as left arrow but opposite directions
- accessibility events added
- transistion added

PS;
- add other flag handling
PS
- enable haptic feedback

rebase

Change-Id: If08904cb709b5969cac451515ec661adbcc1887c

Conflicts:
	core/java/com/android/internal/util/gummy/ButtonsConstants.java
	packages/SystemUI/res/values/slim_strings.xml