* Take into account homeserver capabilities: add `HomeserverCapabilitiesProvider` to check if the HS allows changing the user's display name or avatar. Also, modify the edit user profile screen to reflect these values.
* Add `/myavatar` command. Filter both `/nick` and `/myavatar` commands based on the homeserver capabilities.
* Update screenshots
* Assume the use can change their display name and avatar url if the capabilities check fails: if they try to change those, the HS will return an error anyway.
* Disable also `/myroomname` and `/myroomavatar` based on the HS capabilities.
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Co-authored-by: ElementBot <android@element.io>
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