Fixes #15 - On focus lost, go to pause menu only if in game mode.
Merge pull request #17 from AdrianGaudebert/15-lose-focus

Fixes #15 - On focus lost, go to pause menu only if in game mode.
Fixes #9 - Updated all GUI assets with new colors.
Merge pull request #18 from AdrianGaudebert/9-update-gui-assets

Fixes #9 - Updated all GUI assets with new colors.