v0.2.0-indev

Adds a main menu as the new entry point for the game.

What's New

• Main menu scene (Play, Settings, Credits, Quit)
• Language selection (English/German) accessible from Settings
• Credits screen listing asset sources
• Fixed a bug where the player's chosen language was reset when loading the game scene

What's Changed

• Added main menu with settings and credits screens by @Alcano22 in #3

Full Changelog: v0.1.1-indev...v0.2.0-indev