Make ClassDB::classes pointer-stable again by changing it to HashMap (from AHashMap).

Author: Ivorforce

include/godot_cpp/core/class_db.hpp

@@ -96,7 +96,7 @@ class ClassDB {
 
 private:
 	// This may only contain custom classes, not Godot classes
-	static AHashMap<StringName, ClassInfo> classes;
+	static HashMap<StringName, ClassInfo> classes;
 	static AHashMap<StringName, const GDExtensionInstanceBindingCallbacks *> instance_binding_callbacks;
 	// Used to remember the custom class registration order.
 	static LocalVector<StringName> class_register_order;

src/core/class_db.cpp

@@ -38,7 +38,7 @@
 
 namespace godot {
 
-AHashMap<StringName, ClassDB::ClassInfo> ClassDB::classes;
+HashMap<StringName, ClassDB::ClassInfo> ClassDB::classes;
 AHashMap<StringName, const GDExtensionInstanceBindingCallbacks *> ClassDB::instance_binding_callbacks;
 LocalVector<StringName> ClassDB::class_register_order;
 AHashMap<StringName, Object *> ClassDB::engine_singletons;