add dialog to manage highlighters

- no support for "no color"
- settings not saved to disk

main.py

@@ -12,6 +12,7 @@ import urlutils
 from aboutdialog import AboutDialog
 from ravenui import RavenUI
 from settingsstore import SettingsStore
+from highlightingdialog import HighlightingDialog
 from tabs import Tabs
 from urlutils import url_is_file
 
@@ -64,6 +65,13 @@ class MainWindow(QMainWindow):
         file_menu.addAction(close_action)
         return file_menu
 
+    def highlight_menu(self) -> QMenu:
+        result = QMenu(self.tr("&Highlighting"), self)
+        manage = QAction(self.tr("&Manage"), self)
+        manage.triggered.connect(lambda: HighlightingDialog(self.settings).exec())
+        result.addAction(manage)
+        return result
+
     def help_menu(self) -> QMenu:
         help_menu = QMenu(self.tr("&Help", "name of the help menu"), self)