Improve byte array and callback support

[badcel]

• I agree that my contribution may be licensed either under MIT or any version of LGPL license.

Part of #763

• create a sample which returns an array via the return value
• create a sample with caller allocates = true and an out array
• Add a test for byte arrays in callbacks similar to PixbufSaveFunc
• Add a test for byte arrays in callbacks without length similar to PixbufDestroyNotify
• Support pointed primitive value types for callbacks.
• Support pointed primitive value type parameters for methods.
• Add test for byte array from const pointer
• Support out pointer in callbacks
• Support callbacks with error parameter / throws attribute
• Support callbacks with callbacks with an error parameter
• Support error paramters in callbacks that are not the last parameter of the function signature
• Support error parameters in callbacks of callbacks that are not the last parameter of the function signature
• Support pointer parameters
• Support aliases for pointers
• Support aliases for primitive value type return values in callbacks
• Support callbacks that return instances of classes
• Support callbacks that return instances of interfaces
• Support out pointed primitive value types in callbacks
• Support callbacks containing a pointed primitive value type alias parameter with direction "in".
• Support methods containing a pointed primitive value type alias parameter with direction "in"
• Generalize byte array support to all primitive value types
• copy byte array tests and convert to integer array to verify generalizations.
• Support inout primitive value type arrays