Termux:GUI 0.1.6

Implemented all Protobuf methods Added features for the Protobuf protocol: - setting an Activity to fullscreen - intercepting volume buttons - hardware-accelerated rendering with SurfaceViews - setting the secure flag for an Activity, disabling screenshots and blanking it out in the app switcher WebView fixes Changed the app icon a bit Added more demo videos Implemented a Bash library Implemented a C library (tutorial not yet fully finished)