Push Rule Model Rework

This is a significant rework of the handling of push rules. Rather than using a lot of boilerplate code for the default models `KeywordNotificationModel` has been converted to `PushRuleModel` and now handles all push rules.

The new model has the following features:
- Handles all push rules
- Has special handling for the names of default keywords (i.e. it still gives the same text as previously for showing in the settings menus)
- Push rules for blocking individuals or room overrides are still there but hidden so will be available for developer tools (to follow)
- Room specific keywords are now supported.

The notification settings pages have also been refactored to take advantage of the new models. Each section is now just a repeater with a filter for the rules that it should contain. The push rule delegate has now been cleaned up and uses required properties.

Implements network/neochat#574

src/controller.cpp

@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 #include "controller.h"
+#include "models/pushrulemodel.h"
 
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 #include <qt5keychain/keychain.h>
@@ -126,6 +127,10 @@ Controller::Controller(QObject *parent)
         oldAccountCount = Accounts.size();
     });
 #endif
+
+    QTimer::singleShot(0, this, [this] {
+        m_pushRuleModel = new PushRuleModel;
+    });
 }
 
 Controller &Controller::instance()
@@ -507,6 +512,11 @@ void Controller::setActiveConnection(Connection *connection)
     Q_EMIT activeAccountLabelChanged();
 }
 
+PushRuleModel *Controller::pushRuleModel() const
+{
+    return m_pushRuleModel;
+}
+
 void Controller::saveWindowGeometry()
 {
     WindowController::instance().saveGeometry();