Rewrite LuaJ into LuaK

[Doomsdayrs]

Currently kotlin-lib is dependent on an aging repository called LuaJ, that has been unmaintained for years.

Future plans is to rewrite the entirety of LuaJ in Kotlin with provide cross platform support. This will allow Shosetsu to improve the Lua experience on android, especially for other developers in the future.

[Doomsdayrs]

One migration that we can do for now is to unarchive shosetsuorg/luaj and merge the PRs from the LuaJ parent repository https://github.com/luaj/luaj/pulls and migrate to Gradle.

After that, a migration to Kotlin can slowly occur over time.

[Doomsdayrs]

@TechnoJo4 What are your thoughts on a slow migration?

[TechnoJo4]

LuaJ works right now, and I believe any effort towards the Lua implementation should be put into a full rewrite (LuaK) instead of slowly patching holes with duck tape.

[Doomsdayrs]

https://github.com/korlibs/luak exists, we might rebase onto it