* cppcheck stuff

* Update src/ui/RoomSettings.cpp

Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>

* Update src/ui/RoomSettings.cpp

Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>

* Fix linting

Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>

relates to #1168

Requires MSC3266

Fixes #1129

This makes them less annoying when scrolling or accessing the popup
menu.

See also #860

- Fixes scrolling to an event not being reliable
- Adds new /goto command that can open URLs, go to events, or go to message indexes.
- Refactored ChatPage::handleMatrixUri() to contain the handling originally in Nheko::openLink(), and makes it return a boolean based on whether the URL was handled internally or not.

We explicitly set a parent. We can't assign to
ApplicationWindow.transientParent though, only to
Window.transientParent, so we just call setTransientParent in C++.