* Reintroduce some missing Lua API's from native plugin API
* Add new upvalue functions to header
* Fix things that are actually macros in current lua
* Introduce lua_insert,replace,remove macros from lua5.4
* Getting ready for 2.1.
* Fixed version.
* Year.
* Manually added line as takase said to.
* Fixed minor issue at takase's behest.
* Dunno where that went.
* Updated to use a function pointer.
* OK, as discussed, adding this manually for now.
* Updated SDL.