Add support for default parameter values in ClassServices.registerMethod and @Callable macro support

[rktprof]

Describe the bug I get a runtime index out of range error in a @Callable function with default parameters (see screenshots). This only happens if I call the function from GDScript with findPlayers(2, 2) and not when filling out all the parameters findPlayers(2, 2, 0, 0)

Also tested this with just one default parameter.

To Reproduce

1. Create a @Callable function with one parameter that has a default value
2. Call that function from GDScript without a parameter
3. See index out of range error

Expected behavior Default values should be used if they are not supplied

Screenshots Original function:

Runtime error:

Additional context I've only tested this on iOS but I don't see why it would be device exclusive

[migueldeicaza]

Thank you for this bug report!

The issue is that SwiftGodot does not currently register methods with default argument values.

The following fixes need to take place:

• [ ] Extend ClassServices.registerMethod to take an array of Default values, and pass this to classdb_register_extension_class_method, currently, we hardcode this to zero
• [ ] Make the MacroGodot code that finds @Callable pass the values to the registration method