Incorrect entity type for trigger_counter
As seen in the code trigger_counter has no touch interaction as it is supposed to be a point
entity.
But the entities.ent file shipped with Xonotic incorrectly labels it as a group
(brushwork) forcing mappers to make a blank trigger brush to create a trigger_counter.
Attempting to make a trigger_counter currently without having first made a blank brush for it will fail with the error "failed to create a group entity - no brushes are selected".