More work on WASI to support DOOM #336
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cc #323
Fixes a couple bugs, implements many functions, and implements some kind of stub for a virtual file system for WASI programs.
I've always had in mind to try provide backwards compatibility for existing programs thanks to the efforts of WASI. However I don't really know what to do with programs that read/write files on the filesystem.
As a temporary solution, I've added some kind of poorly-implemented virtual read-only filesystem. This is very much a hack in order to try make DOOM work.