Previously, the CallView was attached to the RoomView, so you would get
a new CallView each time you changed the room and the one you changed
from would be destroyed. This would destroy media capture/playback as
the element was no longer in the DOM.
This is now fixed by having a "global" CallView which is attached at
the MatrixChat "page" level in the DOM hierarchy. This CallView isn't
scoped to a particular room; it will render any "active" call it can
find that *isn't the current room being displayed*. This has the side
effect of enforcing 1 call per app semantics as only the first active
call found is returned.
This fixes https://github.com/vector-im/vector-web/issues/31
This is unfinished (CSS for the global call view isn't done)
Added notification logic to Notifier; dispatch notifier_enabled when toggled
so the toolbar can be shown/hidden and the button text can be kept in sync.
Add MatrixToolbar back into MatrixChat for notification nagging.
* sans-serif font
* use display: table for the message list so that everything lines up nicely
* switch to flexbox layout rather than position absolutes to avoid assuming a full screen UI and improve maintainability (and better match atomify)
* neutralise the colouring and styling of highlighted rooms in the recents list
* switch from ul + li's to a series of divs in some places where the li's are achieving nothing but adding more complexity to the DOM
* add mx_MessageTileType as a generic css base class for all message tiles
