Adapt for mobile

[rdlf0]

The game should be adapted for mobile devices. Possible scenario is:

• Detect mobile devices
• Rotation lock - keep always in portrait orientation
• Only one game mode based on device resolution:
  • calculate optimal rows and columns
  • touch mode setting that is turned on by default on mobile
• Change triggering events to avoid accidental cell revealing:
  • reveal on double tap
  • flag/? on single tap