Implement basic desktop app with chromium embeded framework

[timon-schelling]

Things done:

• getting the frontend to work inside cef like it would be running in a browser
• implement resource handler for bundling frontend files inside the desktop app binary

Known issues:

• shortcuts that include a char key do not work
• shortcuts that include a mouse press do not work
• poor performance for very large windows
• GPU process sometimes crashes during resize, this can take down the whole app if it happens to frequently
  • [ERROR:components/viz/service/main/viz_main_impl.cc:184] Exiting GPU process due to errors during initialization
  • [ERROR:content/browser/gpu/gpu_process_host.cc:957] GPU process exited unexpectedly: exit_code=133
[FATAL:content/browser/gpu/gpu_data_manager_impl_private.cc:415] GPU process isn't usable. Goodbye.
• Some other errors
  • [ERROR:google_apis/gcm/engine/registration_request.cc:291] Registration response error message: DEPRECATED_ENDPOINT
  • Subprocess of type zygote failed

Other possible improvements:

• rerender only dirty regions
• use accelerated draw api
• reduce idle cpu usage
• refactor wgpu parts