Random game mode and options

Just a little post that I have uploaded new version of my frogger game (011) on my project page, there is now a random game mode, and options where you can change difficulty, full screen toggle, and sound and music volume, and an as yet untested MacOSX version.

The fullscreen toggle may be a bit dodgy, it works a couple of times on my linux PC but then has some graphic corruption, I don't know whether that is a Godot problem or graphics drivers.

Adding random gamemode and difficulty took a lot of playtesting. Difficulty mostly changes the speed of the enemies, but there are some other effects too. When you get real good you can play on max difficulty, make sure to have lots of caffeine before this.