use qtwebchannel to communicate with userscript

src/discordpage.h

@@ -1,15 +1,7 @@
 #pragma once
 
-#include "streamdialog.h"
-#include "virtmic.h"
+#include "userscript.h"
 
-#ifdef KXMLGUI
-#include <KActionCollection>
-#include <KHelpMenu>
-#include <KShortcutsDialog>
-#endif
-
-#include <QProcess>
 #include <QWebEngineFullScreenRequest>
 #include <QWebEnginePage>
 
@@ -20,15 +12,7 @@ public:
   explicit DiscordPage(QWidget *parent = nullptr);
 
 private:
-  StreamDialog m_streamDialog;
-  QProcess m_virtmicProcess;
-#ifdef KXMLGUI
-  KHelpMenu *m_helpMenu;
-#ifdef KGLOBALACCEL
-  KActionCollection *m_actionCollection;
-  KShortcutsDialog *m_shortcutsDialog;
-#endif
-#endif
+  UserScript m_userScript;
   bool acceptNavigationRequest(const QUrl &url,
                                QWebEnginePage::NavigationType type,
                                bool isMainFrame) override;
@@ -39,16 +23,10 @@ private:
                            const QString &sourceID) override;
   void injectScriptText(QString name, QString content);
   void injectScriptFile(QString name, QString source);
-  void stopVirtmic();
-  void startVirtmic(QString target);
-  void toggleMute();
-  void toggleDeafen();
 
 private Q_SLOTS:
   void featurePermissionRequested(const QUrl &securityOrigin,
                                   QWebEnginePage::Feature feature);
-  void startStream(bool video, bool audio, uint width, uint height,
-                   uint frameRate, QString target);
 };
 
 // Will immediately get destroyed again but is needed for navigation to