rewrite activity WindowList to use classes from support library and switch WindowListActionBarAdapter to use its functionality

(SHOW_AS_ACTION_... works even on pre api 11 devices)

(ensure compatible look for API Level 7+)

State of control and functional keys is managed internally, i.e. "Toggled behavior" is not used

Functions str* and memset require <string.h> - fixes build witn ndk r16+. Header was included by stdlib.h in ndk < r16.
Remove unused <termios.h> and <signal.h>.