revert to 2.1.4
fixes escape input
drop openGL depends
remove openGL deps
update autoconf
migrate main.c
migrate handrecog_lucykila.c
migrate UI_gtk.c in progress
migrate UI_gtk.c
fixes bugs
Merge branch 'gtk3' of https://github.com/epico/ibus-handwrite

Thanks to Wu Peng, ibus-handwrite now has been ported to GTK3. Nice job!