add several TODO comments

self-note: check this one after you come back!

src/gui/insEdit.cpp

@@ -1253,6 +1253,8 @@ if (ImGui::BeginTable("MacroSpace",2)) { \
 #define CENTER_VSLIDER \
   ImGui::SetCursorPosX(ImGui::GetCursorPosX()+0.5f*ImGui::GetContentRegionAvail().x-10.0f*dpiScale);
 
+// TODO:
+// - add right click line draw in macro editor
 void FurnaceGUI::drawInsEdit() {
   if (nextWindow==GUI_WINDOW_INS_EDIT) {
     insEditOpen=true;