Godot 4.2 is the new default

[migueldeicaza]

Hello folks,

Godot 4.2 is the new default both for SwiftGodot and SwiftGodotKit, I created maintenance branches for 4.1 in both modules for those that need to use those.

With the exception of one "nice-to-have" feature in the #257 task list, everything else is in place now, including hot reloading - which I hope someone can take for a spin and report back.

https://github.com/migueldeicaza/SwiftGodot
https://github.com/migueldeicaza/SwiftGodotKit

Release-wise, I have been using 0.NN for the various binary releases, but I wonder if I should switch to something like "4.2.0.NN" where the first three digits track the Godot version.