C#: Add Ide Connection library and server for the editor

This will be used for communicating between the Godot editor and external IDEs/editors, for things like opening files, triggering hot-reload and running the game with a debugger attached.

editor/editor_node.cpp

@@ -4339,6 +4339,15 @@ bool EditorNode::ensure_main_scene(bool p_from_native) {
 	return true;
 }
 
+void EditorNode::run_play() {
+	_menu_option_confirm(RUN_STOP, true);
+	_run(false);
+}
+
+void EditorNode::run_stop() {
+	_menu_option_confirm(RUN_STOP, false);
+}
+
 int EditorNode::get_current_tab() {
 	return scene_tabs->get_current_tab();
 }