`loadfile` in Lua

A loadfile implementation for SRB2.

Lua scripters:

• loadfile exists now, and it's basically dofile, but instead of calling the file immediately, the file is returned as a function for you to do stuff with, like sending it arguments and doing setfenv shenanigans.

C people:

• LUA_DoLump replaces the old LUA_LoadLump; LUA_LoadLump does loadfile stuff now.
• LUA_DoLump (and by extension dofile) is now implemented internally as the equivalent of loadfile("filename.lua")()

Here's a cool PK3 that self-tests itself. It will check for basically every case I've thought of so far.
loadfile.pk3

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• 6f19615f - Remove unused variable to fix warning in luaB_loadfile.

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• 6f19615f...a68440c4 - 2216 commits from branch STJr:next
• 5693dcad - Merge branch SRB2:next into loadfile

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• b3ef2b33 - Support loadfile in folder add-ons too

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merged

mentioned in commit c2a8d1f7

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