BLI_utildefines: rename pointer conversion macros

Terms get/set don't make much sense when casting values.

Name macros so the conversion is obvious,
use common prefix for easier completion.

- GET_INT_FROM_POINTER  -> POINTER_AS_INT
- SET_INT_IN_POINTER    -> POINTER_FROM_INT
- GET_UINT_FROM_POINTER -> POINTER_AS_UINT
- SET_UINT_IN_POINTER   -> POINTER_FROM_UINT

source/blender/python/mathutils/mathutils_Euler.c

@@ -612,12 +612,12 @@ PyDoc_STRVAR(Euler_axis_doc,
 );
 static PyObject *Euler_axis_get(EulerObject *self, void *type)
 {
-	return Euler_item(self, GET_INT_FROM_POINTER(type));
+	return Euler_item(self, POINTER_AS_INT(type));
 }
 
 static int Euler_axis_set(EulerObject *self, PyObject *value, void *type)
 {
-	return Euler_ass_item(self, GET_INT_FROM_POINTER(type), value);
+	return Euler_ass_item(self, POINTER_AS_INT(type), value);
 }
 
 /* rotation order */