Merge branch 'custom-server' of https://gitlab.informatik.hu-berlin.de/eltschib/mathe-skribbl into custom-server

Add isclose iscorrect

See merge request !2

Merge branch 'custom-server' of https://gitlab.informatik.hu-berlin.de/eltschib/mathe-skribbl into custom-server

Mööööörge

See merge request !1

changed avatar selector at start of game
made play-buttons in same design as other game stuff

added basis arrows and pictures for avatar-customization (eyes, mouth)
made play-button selector better