Method reset

3rdparty/lua/sol/sol.hpp:10306–10311

		}

		void reset(lua_State* L_) noexcept {
			if (valid(L_)) {
				deref(L_);
			}
			ref = LUA_NOREF;
		}

		void reset(lua_State* L_, int index_) noexcept {
			reset(L_);