newline option attempt 2

hopefully the freakin submodule wont get in

doc/8-advanced/chanosc.md

@@ -33,6 +33,7 @@ right-clicking the view will display the configuration view shown above:
   - `%v`: volume (decimal)
   - `%V`: volume (percentage)
   - `%b`: volume (hex)
+  - `%l`: new line
   - `%%`: percent sign
 
 click on OK to return to the main view.

src/gui/chanOsc.cpp

@@ -348,6 +348,7 @@ void FurnaceGUI::drawChanOsc() {
             "- %v: volume (decimal)\n"
             "- %V: volume (percentage)\n"
             "- %b: volume (hex)\n"
+            "- %l: new line\n"
             "- %%: percent sign"
           );
           ImGui::EndTooltip();
@@ -751,6 +752,10 @@ void FurnaceGUI::drawChanOsc() {
                         text+=fmt::sprintf("%s",noteName(noteMod,oct));
                         break;
                       }
+                      case 'l': {
+                        text+="\n";
+                        break;
+                      }
                       case '%':
                         text+='%';
                         break;