Disable the menu items for editing scrubber timer parameters if an inactive scrubber timer is selected. This removes the confusion when users edit a scrubber that is not active, and are then surprised when the scrubber timer does not work during the dive. (mikeller)

Heinrichs Weikamp OSTC4 / OSTC 5 update files.

The builds are for testing purposes only. Be careful, they might not work and are definitely not recommended for real dives.