Add package alias for core/base/mods in general

[Bilka2]

Noise expressions dump the file path, we should be setting the package alias on the mod to prevent lua from using full file paths there. The base game does this by overwriting the lua package alias, we will have research how that is possible in LuaJ.

[Bilka2]

I just looked into it and it looks pretty darn complicated. So maybe just keep the absolute paths ¯_(ツ)_/¯