Update v0.2

Changelog:

• Added a start menu.
• Added named rooms to support multiple game instances.
• Made dating UI elements hidden on startup.
• Made the game start first after both a Tower Defenser and a Dating Similator player has joined.
• Added room name, player role, wave number, game status and game version texts to the game UI.
• Added a semi-transparent quit button which fades in when hovered. It is fully visible on startup and game over.
• Made enemy waves stop spawning on game over.