add GameMenu Dialog in FreebloksActivity, skip StartScreenActivity
game: add join dialog to FreebloksActivity
game menu dialog: add app icon to game menu dialog
game menu dialog: show WhatsNewDialog
game menu dialog: add icon and app_name to dialog
remove StartScreenActivity and unused assets
game: back dismisses GameMenuDialog, and dismisses FreebloksActivity

no way of showing the GameMenuDialog again after first start
game: show menu dialog when cancelling finish or join dialog
vibrate slightly less
view: adjust camera
intro: show intro before showing game menu dialog
intro: tweak camera position
game: cancel intro on back button, if running
game finish dialog: refactoring
intro: simplify PhysicalStoneEffect.render
renderer: optimize BoardRenderer.renderStone
view: refactoring, use less synchronized
game menu dialog: disable resume if resume is not possible
view: always show empty board if no game is running
game: change order of windows again: main menu is above game view

disable resume button, if not available