Fix --help and --version command line options when Nheko is already running. Also adds an info message when it sends a URI to another instance

* Added a text field that allows choosing custom homeserver in "Room directory" dialog.

* Moved "Choose custom homeserver" text field to the right and shrinked it to 30% of "Room directory" dialog's width.

* Adding "server_name=" when needed when joining room.

When joining room that is hosted on a different homeserver than
the account is registered on, the request fails. In such scenario
the server has to be explicitly mentioned in a server_name URL
parameter. More info here:
https://matrix.org/docs/spec/client_server/r0.6.1#post-matrix-client-r0-join-roomidoralias



* Minor fix: intentation (4 spaces -> 8 spaces)

Co-authored-by: Patryk Cisek <patryk@cisek.email>

- 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.

There is not really a reason to stop tracking them, just because the
server says so. We might still want to show a users profile, etc.

Sorry, no fun for you!

fixes #632

- Now scrolls entire profile instead of only device list, improving the experience on smaller screens
- Fixed centering of room name
- Allow profile to be sized smaller to match the new scrolling behavior
- Silenced warning about room being null for global profiles
- Matrix URLs now open global profiles instead of room-specific profiles if the user is not in the currently opened room
- Opening global profile from room specific profile now uses openGlobalUserProfile function instead of reinventing the wheel