Implemented SMK512 controller emulation (extended memory and IDE controller).

Added the ability to save and restore the emulator state.

Added support for hardware game controllers.

Added support for Android TV.

Disk and program image files now are saved and loaded using the system file manager.

Improved behaviour of the on-screen keyboard.

Improved emulation of the CRT raster effects.

Added low pass filters to Covox and speaker outputs.