* refactor; tried to clarify more_messages; new design
* adjust more_messages text spacing
* small fix for height with incoming call on current channel
* move calls-specific code in the calls product behind a hook
* show servername for notifications from other servers
* if >1 active servers, always show server name, otherwise don't
* add height of notification bar in measurements
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Co-authored-by: Mattermost Build <build@mattermost.com>
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