and unrelated to Rust source file location.
When a Lua file is required inside a Rust file (in a chunk), we should resolve the Lua file relative to the current directory,
instead of relative to the Rust chunk path.
The Rust file location is an internal information that does not exist when the compiled binary runs.
Fixes#605
This commit introduces the `Require` trait that be used to change `require` behaviour.
By default mlua implements behaviour same as `ReplRequirer` in the original Luau.
Unfortunately binary Luau modules are no longer supported by the new system.
Alex Orlenko