Fix VMFConfig not loaded on project startup (#50)

Author: Mickeon

addons/godotvmf/godotvmf.gd

@@ -38,8 +38,9 @@ func _enter_tree() -> void:
 	entity_context_plugin = VMFEntityContextMenu.new();
 	add_context_menu_plugin(EditorContextMenuPlugin.CONTEXT_SLOT_FILESYSTEM, entity_context_plugin);
 
+	VMFConfig.load_config()
+
 func _exit_tree():
-	remove_autoload_singleton("VMFConfig");
 	remove_custom_type("VMFNode");
 	remove_custom_type("ValveIONode");