* Render a CollapsibleButton's children (needed by UploadButton)
* Make UploadButton ready to live inside an overflow menu
* Always show overflow menu in composer: main buttons are emoji and attach
* Re-order composer buttons as per design
* Re-word composer button captions to be simple nouns
* Don't rotate More options button when clicked
* Move the composer menu and dialogs 16px in from right
* Reduce shadow on composer More menu
* From review: remove else clause
* From review: take input out of button
* Update test snapshots
* Update snapshots
Adds maplibre as a dependency, and behind a labs flag, lets users send and receive [MSC3488](https://github.com/matrix-org/matrix-doc/blob/matthew/location/proposals/3488-location.md) style location shares - with backwards compatibility with old school `m.location` `msgtype` location shares too.
For this to work, you have to define a valid maptile server and API in your config.json's `map_style_url`.
