Content displayed in a modal dialog. Currently only read-only.

This uses /\blocalpart\b|\bdisplayname\b/i which is overall a lot
better than before. This specifically gets @localpart references
which the bug was originally for.

Use floating-point rather than integer division to handle timeouts so that non-zero but sub-second waits don't collapse to zero

This allows images to be clicked by clicking on the edge with the bubble.
This is important since Redactions are only visible on the event info
screen.

Fix an off-by-one bug in presence event stream pagination; this might be responsible for any number of bug reports

Construct a source-specific 'SourcePaginationConfig' to pass into get_pagination_rows; meaning each source doesn't have to care about its own name any more

UI for redactions is now complete.

I think this is better than overriding the right-click contextual menu.
Currently clicking this button does nothing.

Added a small 10px buffer so if the list isn't quite at the bottom it
still actually scrolls.

JSON is displayed as a modal dialog via AngularJS' bootstrap module,
"ui.bootstrap".

Display all error messages from the server when registering, rather
than just the types of errors the client recognises.

Wrap preparing the database in a transaction. Otherwise it will take many seconds to complete because sqlite will create a transaction per statement

switch from the deprecated msg.content.prev to msg.prev_content.membership, and fix the bug where kicks of unjoined users aren't displayed sensibly in the history