Add button in midi settings to refresh midi devices

Deletes and creates a new RT midi instance allowing for midi devices to be plugged in without restarting

src/audio/midi.cpp

@@ -58,4 +58,9 @@ void TAAudio::quitMidi() {
     delete midiOut;
     midiOut=NULL;
   }
+}
+
+bool TAAudio::reinitMidi(bool jack) {
+  quitMidi();
+  initMidi(jack);
 }

src/audio/taAudio.h

@@ -178,6 +178,8 @@ class TAAudio {
     virtual std::vector<String> listAudioDevices();
     bool initMidi(bool jack);
     void quitMidi();
+    /** remove and reload midi to allow hotswaping midi devices */
+    bool reinitMidi(bool jack);
     virtual bool init(TAAudioDesc& request, TAAudioDesc& response);
 
     TAAudio():

src/engine/engine.cpp

@@ -3473,6 +3473,15 @@ void DivEngine::rescanAudioDevices() {
   }
 }
 
+
+void DivEngine::rescanMidiDevices() {
+  if (output!=NULL) {
+    logV("reloading midi...");
+    output->reinitMidi(false);
+    rescanAudioDevices();
+  }
+}
+
 void DivEngine::initDispatch(bool isRender) {
   BUSY_BEGIN;
   logV("initializing dispatch...");

src/engine/engine.h

@@ -1077,6 +1077,9 @@ class DivEngine {
     // rescan audio devices
     void rescanAudioDevices();
 
+    /** rescan midi devices */
+    void rescanMidiDevices();
+
     // set the console mode.
     void setConsoleMode(bool enable);
 

src/gui/settings.cpp

@@ -1129,6 +1129,13 @@ void FurnaceGUI::drawSettings() {
           ImGui::EndCombo();
         }
 
+        ImGui::SameLine();
+        if (ImGui::Button("Reload MIDI devices")) {
+          e->rescanMidiDevices();
+          audioEngineChanged=true;
+          settingsChanged=false;
+        }
+
         if (hasToReloadMidi) {
           midiMap.read(e->getConfigPath()+DIR_SEPARATOR_STR+"midiIn_"+stripName(settings.midiInDevice)+".cfg");
           midiMap.compile();