Added new lua external (pd-lua with graphics, signals and coding directly into the object)

[timothyschoen]

Hope this works for you? I copied the build system back over from before pdlua was removed.

[porres]

I se, the idea now is to merge the pd-lua code into the else.c code and compile the else binary with the lua object loader.

Then we just need to copy the pd.lua file (this is the [lua] object, right?) into the folder and we must also have a 'lua-help' file with all the lua information

[porres]

I could build it but github actions said it didnt work for windows