platform/linux-sdl: Handle emulator and device input events
platform/linux-sdl: Handle emulator and device input events

Change list:
- Add support for emulator zoom-in/zoom-out with +/- keys
- Add support for quick exit via ESC key
- Show device screen resolution/zoom/frame counter in the window title
- Pass host's keyboard events to mikrogui's input system (for easy
  development on pc-host)

Signed-off-by: Nikolay Dimitrov <dfc921bb2213e22cc8f30fd615839493d2074dee@mail.bg>

picmaster/mikrogui