Fix Changelog.

Refs #5991
Add 'is_reachable' support for Classic UI (Icinga 2)

Fixes #6186
Add {host,service}{groups,status] columns: notes, notes_url, action_url, is_reachable.

Refs #6060
Merge branch 'support/1.11' of git.icinga.org:icinga-core into support/1.11
IDOUtils: Add is_reachable columns for {host,service}status tables.
Update Changelog.

Refs #6060
Refs #6094
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