Merge branch 'master' of https://github.com/tildearrow/furnace into es5506_alt

* 'master' of https://github.com/tildearrow/furnace:
  GUI: sample/macro zoom with ctrl-wheel
  GUI: prevent division by zero
  GUI: possibly fix an instrument saving issue
  GUI: add chip randomizer button
  update to-do list
  oops
  NES: add DMC write effect
  SoundUnit: implement panning
  QSound: implement panning macro - PLEASE READ
  further improve channel allocation
  update format.md for eventual ExtCh extra systems
  improvements to swap/stomp channel

# Conflicts:
#	src/gui/insEdit.cpp

src/gui/sampleEdit.cpp

@@ -1333,6 +1333,17 @@ void FurnaceGUI::drawSampleEdit() {
         }
 
         if (ImGui::IsItemHovered()) {
+          if (ctrlWheeling) {
+            double zoomPercent=100.0/sampleZoom;
+            zoomPercent+=wheelY*10.0;
+            if (zoomPercent>10000.0) zoomPercent=10000.0;
+            if (zoomPercent<1.0) zoomPercent=1.0;
+            sampleZoom=100.0/zoomPercent;
+            if (sampleZoom<0.01) sampleZoom=0.01;
+            sampleZoomAuto=false;
+            updateSampleTex=true;
+          }
+
           int posX=-1;
           int posY=0;
           ImVec2 pos=ImGui::GetMousePos();