Add EventFilterInterface::onMouseEvent()

Some event consumers don't want to overload N methods and just
overload one instead

src/qtcommon/Platform_qt.cpp

@@ -163,9 +163,13 @@ public:
 
         for (EventFilterInterface *filter : filters) {
 
+            // Filter might have been deleted meanwhile
             if (std::find(q->d->m_globalEventFilters.cbegin(), q->d->m_globalEventFilters.cend(), filter) == q->d->m_globalEventFilters.cend())
                 continue;
 
+            if (filter->onMouseEvent(view.get(), ev))
+                return true;
+
             switch (ev->type()) {
             case QEvent::MouseButtonPress:
                 if (filter->onMouseButtonPress(view.get(), ev))
@@ -450,4 +454,4 @@ Platform::DisplayType Platform_qt::displayType() const
 bool Platform_qt::isLeftMouseButtonPressed() const
 {
     return qGuiApp->mouseButtons() & Qt::LeftButton;
-}
+}