Add android backend
stage: deactivate picking optimization on android
android: add fullscreen & resize support
android: add event source
android: don't leak untranslated events
android: add application API to show/hide virtual keyboard
android: add initial support for keycode translation
android: more keycode support
android: move keycodes arrays to text section
android: prevent mainloop from starving on events
stage: add samples-per-pixel property for anti-aliasing setup
android: remove a couple of traces
android: add touch event support
android: don't use id=0 as touch sequence
android: more traces & code readability in touch translation
drag-action: make behavior coherent between pointer & touch events
android: expose cluttter_android_application_get_default()
android: add onContentRectChanged support (for keyboard)
android: avoid usage of deprecated API
android: support application lifecycles where we can keep the stage alive