F17540: Changed match expression with switch statement for phpunit. Added new constants. refs #17540

F17540: WIP: V1.1 Cleaned code and refactoring search feature in combination with threads. refs #17540

F17462: Improvement websocket server start/stop. Added documentation and manual to install websocket. refs #17462

Refs #17255 - If the record has been modified in the meantime, an alert will still be shown but the error will not be logged.

Refs #8702 - Added functionality to check if the record is already locked after loading the form. If the record is locked by another user, an alert is displayed with the message "The record has been locked by user 'user1' until 28.12.2023 10:16:51.".