New version to be found in the old place.


- LibCall() will now fail if the called function failed (the result is a NIL value)
- LibCall() can return Integer values
- "virtual structs" aka just pointers without a closer definition did already

Updated the example to reflect that.

I have also changed muistructs.lua to register all structs at launch. This will lead to a noticeable delay and eats quite some memory (the whole thing also still leaks some).

I do have some idea to reduce the bloat (and will for sure fix the leaks) but that requires some testing.

Todo:
- clean up code
- debug versions that provide info useful for developing scripts

I will now switch focus on 1 or 2 other projects where I plan to use LUA_MUI which should help finding and fixing remaining issues.