Lua port of Ninja Thief

[Daft-Freak]

Still has a few issues, but mostly works

• The collision code relies on integer truncation to not go out of bounds for negative positions, lua doesn't have a built-in function for this, so we're reading out of bounds... which works out as it just returns nil
• I'm not seeding the random generator in episode 4/5 as there isn't anything to seed it with. (Though this is also broken in the C++ version on hardware)
• Didn't bother copying the map data until episode 5, so that ends up a little messy
• There seems to be a bug where enemy ninjas get stuck at the bottom of a ladder sometimes, not sure if I introduced that or not
• Needs Fix loading files on pico builds 32blit-lua#18 to work on pico (2) and also for require to work (+ some more patches for it to work in SDL)
• Also needs 32blit/32blit-lua@2917dcf for Surface.load
• I think I committed both the source images and the generated assets, but you need to run the tool manually to generate them so... 🤷
• This is only the code, no tutorial updates here.