Add Shortcut Settings for Quitting Editor

Adds the ability to change the shortcut keys in Editor Settings for quitting the editor.

editor/editor_node.cpp

@@ -5943,7 +5943,7 @@ EditorNode::EditorNode() {
 	recent_scenes->connect("id_pressed", this, "_open_recent_scene");
 
 	p->add_separator();
-	p->add_item(TTR("Quit"), FILE_QUIT, KEY_MASK_CMD + KEY_Q);
+	p->add_shortcut(ED_SHORTCUT("editor/file_quit", TTR("Quit"), KEY_MASK_CMD + KEY_Q), FILE_QUIT, true);
 
 	project_menu = memnew(MenuButton);
 	project_menu->set_flat(false);
@@ -5977,9 +5977,9 @@ EditorNode::EditorNode() {
 	p->add_separator();
 
 #ifdef OSX_ENABLED
-	p->add_item(TTR("Quit to Project List"), RUN_PROJECT_MANAGER, KEY_MASK_SHIFT + KEY_MASK_ALT + KEY_Q);
+	p->add_shortcut(ED_SHORTCUT("editor/quit_to_project_list", TTR("Quit to Project List"), KEY_MASK_SHIFT + KEY_MASK_ALT + KEY_Q), RUN_PROJECT_MANAGER, true);
 #else
-	p->add_item(TTR("Quit to Project List"), RUN_PROJECT_MANAGER, KEY_MASK_SHIFT + KEY_MASK_CMD + KEY_Q);
+	p->add_shortcut(ED_SHORTCUT("editor/quit_to_project_list", TTR("Quit to Project List"), KEY_MASK_SHIFT + KEY_MASK_CMD + KEY_Q), RUN_PROJECT_MANAGER, true);
 #endif
 
 	menu_hb->add_spacer();