Prevent Back key behavior

Send backkey character from preIme()
Add ? Icon
Add minus icon
Add actionbar key mapping
Add minus button action
Add IME shortcuts
Add toggle keyboard escape sequence
Add IME escape sequence
Add hardware acceleration escape sequence
Add hardware accelaration preference
Add Alt buffer escape sequence
Add shutdown escape sequence
Add text copy escape sequence
Add dev escape sequence
Add confirm dialog
Add composing text style
Add thumb ctrl
Fix select text two rows offset (adhoc)
Tap on a URL causes a crash (hotfix)
Improved Japanese translation