Pull the generic aspects from Room search and join room pages into it's own component. This is done in anticipation of using the new generic search page for a user search functionality.
- `SearchPage` is now used for the generic version with the old one being renamed `RoomSearchPage`
- `JoinRoomPage` is renamed to `ExploreRoomsPage` inline with everywhere else in NeoChat
There is also some cleanup of the code for both search pages in here.
After downloading a file, the model calls the extractor and uses the
JSON to show some basic information about the content and allows to import
the data to Itinerary. This is entirely runtime-optional; no build-time dependencies
are required and nothing changes if the extractor isn't available.
If the last active connection is not reachable (server down, keychain problems,
token revoked, etc.), NeoChat currently fails to load at all, with the only fix
being to delete a line from the config file. This is surprisingly hard to fix with
a nice UX as long as we stick to the principle of loading the user's last active
connection automatically.
This patch thus drops that principle; instead, the user is always asked to choose
the connection to continue with.
Create a mobile version of explore component and place it at the bottom for single handed use. This also refactors the UserInfo component so it can be at the top on mobile as well as the bottom on dektop.
This should have no effect on desktop and should be identical.

Move the functionality to cache the contents of a chat bar from the room directly and to a new ChatCache object. This works pretty much the same with a few extra check and balances, this also made it easy to put a test suite around the functionality so I did. The current functionality should be identical to what exists.
This is in prep for threads which will require managing even more caches if we create one per thread.
This is an update to searching the public room list. Currently if you can't find the room you're looking for you can type a full alias of room ID into the search bar and a view/join button appears. This is hard to discover and technically broken since it was turned into a generic component for finding rooms (it kinda works but doesn't fit now as it's focussed on the joining rooms not adding new ones to spaces). It is also not very discoverable if you don't know it's there.
This patch patch updates the workflow to be truly generic and hopefully more discoverable. Instead of using the search bar if no results are found a button asking if someone wants to manually enter a room ID or alias appears. This launches a dialog where the user can type in an alias or ID and it has some basic checking to make sure the string looks as expected.
The new functionality also generically works for joining rooms and adding children to spaces.
Add a space homepage with the ability to both create new room and add existing rooms to the space. This uses a tree model for the space hierarchy and will go to any number of levels. The user should only see the add options if they have appropriate permissions.
This MR also combines the create space and room pages and adds a lot of optional functionality for managing space children.

Similar to text handler, pull out the disparate array of functions which format information from an event ready for display in the UI and put in a handler class with a test suite.
requires https://github.com/quotient-im/libQuotient/pull/686
Previously, some functions that conceptually belong to the connection needed to be in the Controller, since we didn't have a place to put them.
This fixes that by extending the Connection class in a similar way as we extend the Room class.
Merge the functionality of CollapseStateProxyModel into MessageFilterModel there is no need for a whole separate model the filters can be combined trivialy.
- Split the list into sections for "this devices", "verified devices", "unverified devices", and "devices without encryption support"
- Sort the lists by last activity