UNUSED() macro so -Wunused-parameter can be used with GCC without so many warnings.

applied to python api and exotic.c, removed some args being passed down which were not needed.

keyword args for new mathutils types were being ignored when they should raise an error.

source/blender/python/intern/bpy_rna.h

@@ -99,7 +99,7 @@ void pyrna_alloc_types(void);
 void pyrna_free_types(void);
 
 /* primitive type conversion */
-int pyrna_py_to_array(PointerRNA *ptr, PropertyRNA *prop, ParameterList *parms, char *param_data, PyObject *py, const char *error_prefix);
+int pyrna_py_to_array(PointerRNA *ptr, PropertyRNA *prop, char *param_data, PyObject *py, const char *error_prefix);
 int pyrna_py_to_array_index(PointerRNA *ptr, PropertyRNA *prop, int arraydim, int arrayoffset, int index, PyObject *py, const char *error_prefix);
 PyObject *pyrna_array_index(PointerRNA *ptr, PropertyRNA *prop, int index);