Using `misc/scripts/fix_headers.py` on all Godot files.
Some missing header guards were added, and the header inclusion order
was fixed in the Bullet module.
- Make ScriptCreateDialog disable the built-in script checked button if the language does not support it.
- ScriptLanguage's get_template and make_template now receive the script path as class name if the the script language does not have named classes.
Rémi Verschelde
Ignacio Etcheverry
Emmanuel Leblond