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

* 'master' of https://github.com/tildearrow/furnace:
  maybe uninitialized
  GUI: prepare for a per-channel oscilloscope?
  GUI: add backdrop if system file picker is open
  GUI: add ability to customize startup system
  GUI: finally implement "don't scroll when moving c ursor" setting
  new panning effects (80/81/82)
  GUI: fix sample paste crash
  GUI: implement sample scroll with mouse wheel
  sysDef oopsie

# Conflicts:
#	src/gui/guiConst.cpp

src/engine/platform/swan.cpp

@@ -412,7 +412,7 @@ int DivPlatformSwan::dispatch(DivCommand c) {
       }
       break;
     case DIV_CMD_PANNING: {
-      chan[c.chan].pan=c.value;
+      chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
       calcAndWriteOutVol(c.chan,chan[c.chan].std.vol.will?chan[c.chan].std.vol.val:15);
       break;
     }