Better exception handling.

[Booklight12]

Add try catch key characters to make gdscript easier to use

[AThousandShips]

GDScript doesn't feature exceptions, so this would require adding them, not just adding try and catch, also this could only deal with GDScript errors, not errors from native functions and builtin classes

[AThousandShips]

Also this is a duplicate of #4736, please see there instead (that one is not suggesting it directly but is about the topic and the discussions there)

[Calinou]

• This is already being tracked in Exception handling (try catch) in gdscript #4736.