Add common locking level - LSM 3.5 SP3 Basic Online

You must take the following into account for common locking levels:

Common locking levels must use the same protocol generations.
The red locking level should only be used for the fire service or other emergency services since it has been specifically optimised for this particular use.

In principle, a common locking level is used in the same way as any other locking system, e.g. using the "New locking system" button in the icon bar: