Added warning if Imagick is not installed/enabled. #590
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If GD is used instead of Imagick, rotating uploaded pictures leads to
a loss of their metadata. Since this is unexpected and maybe a problem,
the diagnostics should show a warning.
This commit displays a warning if it's either not installed or not
enabled in settings.
Maybe, rotating pictures etc. should even be optional in case the user
can't install imagick and still doesn't want to lose the metadata?