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.
It seems at some point in time the 16x16 tray icon got lost/hastily upscaled to a 22x22 tray icon,
which resulted in proportions as well as icon guidelines being slightly off.
This replaces the tray icon with a new one redrawn to adhere to icon guidelines and proportions closer
to the colour icon.
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.
