remove remaining count fields

[PieterVdc]

the count field at the top just causes confusion, so would be better if refactored away, and just counting the actual entries instead

• [ ] creature.cfg
• [ ] crstates.cfg
• [x] cubes.cfg #3181 3181
• [ ] keepcompp.cfg
• [ ] lenses.cfg
• [x] magic.cfg #3311
• [x] objects.cfg
• [ ] terrain.cfg
• [x] trapdoor.cfg #3182

[ErminioLucente]

Totally, on more than 1 occasion i forgot to update the count and wondered why my spell was not functioning.