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.

If you use your private keys (like when deleting the quotient database)
your session is broken as you have differing keys on the server. While
it is possible to work your way out of it, it's better to warn users to
bite the bullet and log in again.
This introduces a new base delegate that handles sizing the content of delegate in the timeline, i.e. it handles all the size helper stuff. This is then used for all the other main delegates:
- messages
- state
- read marker
This means they now all have identical base code to do the sizing (read marker still had legacy code).
Because the new base delegate is called `TimelineDelegate` both `TimelineContainer` and `MessageDelegate` have been renamed:
- MessageDelegate -> TextDelegate - this never made sense before images, videos, etc are all technically messages in Matrix parlance
- TimelineContainer -> MessageDelegate - this has always really been the base for messages
Note - this is mostly groundwork for dealing with the layout polish loop spam which will hopefully be fixed in part 2 with a bubble rework.
Rework the file menu so that it no longer relies on having a reference to the media delegate to manage a download for either opening externally or copying to clipboard. This allows the menus to be moved out of the delegates and maximize components and have them accessed through RoomManager. This reduces duplication and reduces the number of components in an already heavy delegate.