wasm: support `vendor:stb/truetype` and `vendor:fontstash`

[laytan]

• Adds linking of wasm object files to the compiler and linker, very simply looks at the file extension being .o, I am open for better ideas but we already have a bunch of file extension checks so it should fit the codebase
• Makes the core:os package work much better on wasi, previously it would take file descriptor number 3 and use that as the relative base for every os.open, this only works (and only with relative paths) if the environment makes number 3 the current directory. Now we use the preopen functionality correctly by retrieving them all to check paths given to os.open against
• Adds a separate compilation of a wasm object file to vendor:stb/truetype and redefines the stdlib symbols it would normally use to Odin's definitions

I found a bug #3856 which makes the fmod definition not work, I added a panic for now, which in my use-case wasn't hit because this is only used in a single exported function.

[laytan]

I might move the preopen things out of @(init) so it is not compiled in when you don't use os.open

EDIT: nevermind, thinking about threading and allocations make me change my mind