Clean up unnecessary Foundation imports

[tishin]

This leaves only 2 imports in SwiftGodot where Foundation is actually used:

• PackedByteArray.asData() returning Data
• Numeric.snapped native implementation using floor()

Both can be refactored without using Foundation dependency, which is too heavy for non-Darwin platforms compared to the convenience it brings. I think it should be up to users to decide whether they want to include Foundation into their game or not.

[migueldeicaza]

Thank you, I didn’t realize Foundation was the source of this pain.

I don’t mind removing the asData() one for the sake of reducing the dependency. Would love to find a way of making people’s lives easier still for that common idiom.

[migueldeicaza]

I just dropped the asData with the suggestion from above.