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Fixes #105

Appointments now separated from system notifications, below
calendar.

Top bar height increased. More options under "Power Off / Log Out".

No more Sign In button; session type switcher has moved

Fixes #77

See d688237e and
gnome-control-center#1151

Appointments now separated from system notifications, below
calendar. Highlighting in top bar changed from blue underline
to grey background.

No dropdown arrow in top bar anymore. Highlighting in top
bar changed from blue underline to grey background.
Background color of selected menu item is lighter.

Highlighting changed from blue underline to grey background

Selection is grey instead of blue. Corners are more rounded.

Also updating / removing outdated screenshots.

Fixes #100

Also fix order of pre-defined items to be in sync with UI.

Too many colliding abbreviations out there to cover them all:
https://en.wikipedia.org/w/index.php?title=Print_Screen&oldid=1000302238

Fixes #95

This commit does not update the GNOME Classic documentation.

This commit does not update figures/shell-workspaces.png which
may require two images (applications grid vs workspaces preview).