Consider page visibility when marking messages as read #211
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Use page visibility API to only mark messages as read if they're visible.
All browsers should be able to detect if the tab is in the background. Whether a minimized or obscured window as well as an active lockscreen ar detected, depends on the OS and browser.
PR contains vendorized angular-inview until the fix is upstream. Fixes #17 and #108. Obsoletes #210.