Expose RawLua via Lua::exec_raw_lua #670
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See issue #671, #215, and commit 9f0fc27.
This PR solves the problem is a similar manner. It exposes a simple api
Lua::exec_raw_lua(), which runs a callback, that takes a&RawLuaas the argument. That allows usage of the unsafe methods ofFromLuaandIntoLuatraits to interact with the stack on a lower level. Just like the previous solution, this PR's method is marked#[doc(hidden)].