Enums and slices support

[VisenDev]

I've added support for both slices and enums in my generic push and pop functions

[VisenDev]

hmm it seems not all versions of lua have the "lua_len" function, I may have to find a work around

src/lib.zig:1170:10: error: root struct of file 'cimport' has no member named 'lua_len'

[VisenDev]

TODO:
DONE - finish pushSlice implementation
DONE - audit all pointer processing functionality to make it less messy. Pointers have quite a bit of nuance in how they should be converted. (I underestimated this so I didn't really implement it with an overarching plan in mind)
DONE - see if there is a way to avoid the extra memory duplication in toSlice (this would require a lua version agnostic len function)

[natecraddock]

hmm it seems not all versions of lua have the "lua_len" function, I may have to find a work around

src/lib.zig:1170:10: error: root struct of file 'cimport' has no member named 'lua_len'

I'll take a closer look tomorrow, but you can use lua_rawlen or lua_objlen in older versions of Lua.

I would use lua_objlen and lua_rawlen specifically in this case, because both bypass metamethods iirc

[natecraddock]

Just a couple things, everything else looks good!