Make colon copy and pasteable, fix #783

Merge pull request #773 from DvdGiessen/unregister_shutdown_function

Disable shutdown function when not registered

Unregister/cleanup handler on destroy (#778)

Co-authored-by: pascal.heidmann <pascal.heidmann@check24.de>

Prevent javascript error: "TypeError: can't access property "scrollIn…

…toView", line is undefined" (#776)

changelog 2.18.0

changelog: 2.17.0

changelog: 2.16.0

changelog: 2.15.4

changelog: 2.15.3

changelog: 2.15.2