Implement basic interface (GameHost)

[Guerro323]

The simple interface should contains:

• A bgm selector
  • Should possess a way to search elements
• A bgm viewer (possibility to see the metronome, and player's action)
  • We need to see the player pressures inputs
  • We need to see the sliders inputs
  • We need to know when a command has been entered (feedback)
• Some debugging informations (perf, logs, commands)
• A quit button

[Guerro323]

closed since this was for the very early test build of PataNext/GameHost