Implement summary macros e.g. $icinga.num_services_critical$.

Additional $icinga.uptime$ macro.

Fixes #2742
Implement CompatUtility::GetCheckableCommandArgs() for DB IDO, Livestatus, StatusDataWriter.

Fixes #5926
Docs: Fixed some typos.

Signed-off-by: Michael Friedrich <Michael.Friedrich@netways.de>
Rename Dependency 'state_filter' to 'states'.

Fixes #6113
Documentation: Fix notifications for hosts and services.

Fixes #6114
Add debug log entries for dependencies.

Refs #5872
Documentation: Apply new structure.

Fixes #6115
Fix string conversion in CompatUtility::GetCheckableCommandArgs().

Refs #5926
Don't allow "managed" downtimes to be deleted by users.

Fixes #5980
Documentation: Change order.

Refs #6115
Documentation: Fix subsections.

Refs #6115
Migration: Remove broken script, update documentation for work-in-progress.

Refs #5821
Documentation: One more subsections fix.

Refs #6115
Make sure handles aren't inherited by the child process.

Refs #6107
Properly shut down TLS streams.

Refs #6107
Implement support for the "package" keyword.

Refs #6107
Run INITIALIZE_ONCE() after static initializers.

Refs #6107
API thingie (WIP).