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)

modules/gdnative/nativescript/nativescript.cpp

@@ -111,6 +111,13 @@ void NativeScript::_placeholder_erased(PlaceHolderScriptInstance *p_placeholder)
 
 #endif
 
+bool NativeScript::inherits_script(const Ref<Script> &p_script) const {
+#ifndef _MSC_VER
+#warning inheritance needs to be implemented in NativeScript
+#endif
+	return false;
+}
+
 void NativeScript::set_class_name(String p_class_name) {
 	class_name = p_class_name;
 }