Mainly PS12. Also added some early info on how maze score works
The special target cases are marked as bugs and will be restored on a second pass. For now we need to verify that the highest score of 80 points is achievable if all targets are normal ones.
Only fixes for rooms PS10, PS11. A few cases may need revising.
There are a few cases that a target may reset after being shot and they seem buggy but they could also be intended. So, that's for a second pass to decide.