Improvements for linking to events

* 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 build with new libolm

Currently translated at 84.0% (478 of 569 strings)

Co-authored-by: Priit Jõerüüt <nhkwlate@joeruut.com>
Translate-URL: https://weblate.nheko.im/projects/nheko/nheko-master/fi/
Translation: Nheko/nheko

Currently translated at 100.0% (569 of 569 strings)

Co-authored-by: Priit Jõerüüt <nhkwlate@joeruut.com>
Translate-URL: https://weblate.nheko.im/projects/nheko/nheko-master/et/
Translation: Nheko/nheko

- 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.

If this is still broken, we will need to disable it again.

Implement a binding to go to a room with unread messages

Add jdenticon support

Updated by "Cleanup translation files" hook in Weblate.

Co-authored-by: Weblate <noreply@weblate.org>
Translate-URL: https://weblate.nheko.im/projects/nheko/nheko-master/
Translation: Nheko/nheko

Currently translated at 100.0% (569 of 569 strings)

Co-authored-by: Jaron Viëtor <jaron@v8or.nl>
Translate-URL: https://weblate.nheko.im/projects/nheko/nheko-master/nl/
Translation: Nheko/nheko

Currently translated at 100.0% (560 of 560 strings)

Co-authored-by: Tirifto <tirifto@posteo.cz>
Translate-URL: https://weblate.nheko.im/projects/nheko/nheko-master/eo/
Translation: Nheko/nheko

Currently translated at 90.5% (507 of 560 strings)

Co-authored-by: Tirifto <tirifto@posteo.cz>
Translate-URL: https://weblate.nheko.im/projects/nheko/nheko-master/eo/
Translation: Nheko/nheko

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.