This fixes a common React warning we see. Most of these components should be using constructors instead, however componentDidMount is just as good (and doesn't require converting most of these).
Conversion to classes will be done in a later stage of React warning fixes.
For https://github.com/vector-im/riot-web/issues/12877
It can take some time to actually set the status message and see it play back as
a committed event. This adds a spinner for immediate feedback so it's clear
that something is happening.
Fixes https://github.com/vector-im/riot-web/issues/8135.
This updates the custom status context menu to match the latest comps. A single
button is used for setting / clearing, depending on what is appropriate.
The state logic is also changed to depend on events and storage from js-sdk for
the committed status message. This makes it easy to distinguish the value being
edited from what's currently committed.
