* improves previous commit 13cd243a031ca6c52457032e0bffc8576b549b3a ,
the problem is that both server and client must be equal protocol, so
this ugly hack check if this was loaded into FinalMinetest or Multicraft
to dinamically check client nature and re-registering the model when
server and client do not have same player models due the colisionbox check
* NOTE: the check already need to check if the engine is old and the server not,
so the conditional just try to do exact check agains TRUE boolean.
* Closed https://codeberg.org/minenux/minetest-game-minetest/issues/12
fixed the problem of collisionbox for the lufix player in ugly way but
much more effectivelly due can be mixed in FinalMinetest and Multicraft
* Player model: Remove vertical 1 node offset for new engines, but
Required due to the settable player collision box engine feature
change for MT/MTG v0.5.0 that breaks compatibility with old client
so due that this commit will added backguard compatibility
* Autodetec minetest versoin engine and provide right model
character, update player code to provide compatibility with player_api
