Multiple font sizes and a Windows build

I've updated the game with a critical feature for playability on larger monitors: support for multiple fonts and changing them in-game. The game now sports a 24x24 and 32x32 font set, which should be ideal for 2K and 4K monitors respectively. These are just upscaled versions of the existing 16x16 fonts, so the 24x24 version has notable upscaling artifacts - I'll clean this up manually when I find the time.

Additionally, I've released a native Windows build of the game, which will be updated in future releases alongside the existing browser version.