[Mod support] The decomp of mk64 are not done

For now the decomp of [mk64](https://github.com/n64decomp/mk64) are not done (not all function match to there asm and need to be documented). While the decomp are not done we can't change too much of code because else we will get a lot of conflict when we will merge, so we can't redo system to be more flexible because a lot of thing are hardcoded and just bad coded.

But the language will be wasm to support a wide variety of language. Mod will be under the format o2r (a zip rename). And we will try to make programming as optional as possible by using json/yml or other format. The format of the api are not sure because we have different point of view on this.

No files, tests, or entry points are named. Start by reviewing the mk64 decompilation status and the existing hardcoded systems, then clarify the mod API and o2r format proposals. Done is not defined yet: the issue needs an agreed scope for wasm support, optional programming, and configuration formats.

Written by the indexing model from the issue text.