Replace meta 3rd with LuaCATS submodules

[carsakiller]

This replaces all the included addons with their LuaCATS mirror as submodules. Until they are removed, this should help us keep one source of truth up to date and in sync.

I'm not sure, but I am assuming there will need to be an additional step added to the build process that retrieves all of these submodules for compiling.

luv and ffi-reflect do not yet have LuaCATS mirrors, so they have not been swapped out.

[carsakiller]

@sumneko thoughts on this? Will there need to be modifications to the build/publish workflows in order to pull all of these submodules?

[sumneko]

Maybe you can just put them into meta/3rd ?

[carsakiller]

They are? I don't think I understand.

[sumneko]

They are? I don't think I understand.

I was mistaken. This PR is indeed in the form I expected.

[sumneko]

Is this ready?

[carsakiller]

I have not yet moved luv and ffi-reflect to LuaCATS, but also, I am unsure of if the submodules will be bundled into the release properly. Do I need to change any configuration files to make sure that these submodules are initialized during the build and included in the release?

[sumneko]

Do I need to change any configuration files to make sure that these submodules are initialized during the build and included in the release?

I'm not sure either. However, we can observe the build results and fix any issues that arise.

[carsakiller]

Should be ready to go!