core: Revert "add colon to illegal_object_name_chars" (#4227)

Fixes #5931
Update docs.
Buildfix.

Refs #6186
Get rid of t-tap/ and license issues.

Fixes #6022
Get rid of json checker and license issues.

Fixes #6023
Update Changelog, fix sql upgrade scripts for 1.11.3
Release 1.11.3