Add ability to bind typed arrays to script API

Note: Only replaced 2 instances to test, Node.get_children and TileMap.get_used_cells
Note: Will do a mass replace on later PRs of whathever I can find, but probably need
a tool to grep through doc.
Warning: Mono will break, needs to be fixed (and so do TypeScript and NativeScript, need to ask respective maintainers)

core/method_bind.h

@@ -39,6 +39,7 @@
 #include "core/method_ptrcall.h"
 #include "core/object.h"
 #include "core/type_info.h"
+#include "core/typedefs.h"
 #include "core/variant.h"
 
 #include <stdio.h>