Analog stick and autofire support

Updates in the latest version from May 12, 2025:

• Better support for game controllers. This includes analog sticks which can now be used both in the main menu and for more fine-grained control of the aircraft in-game.
• Autofire added; see details under "Controls".
• Rocks on level 2 have been adjusted so that it no longer looks like they hover above ground.

Best regards,

Christian