Rewrite entire project

[Lustyn]

This PR just serves as an ongoing track of what needs to be and has been done about the coroutine-based rewrite.

TODO:

• Coroutine/"Thread" based event loop (no upvalue abuse)
• Better documentation
• Documentation of thread system and considerations to make when using it
• Parameter assertions
• Unit tests
• Howl CI (maybe?)
• Promises
• Await
• Rewrite major sister libraries (r.lua, w.lua, k.lua)

Major Notes:

• To prevent confusion and maintain compatibility, the default event "thread" implementation forks itself.
• Added jua.onInterval and jua.onTimeout, they are the same as jua.setInterval and jua.setTimeout but their arguments are reversed to follow the same scheme as jua.on
• Up-to-date versions of any Jua libraries by me are available in the jua2 branch of their respective repositories. Any testing should be done with those versions.