Revise spinheight/gap entry conditions (again), let's keep things WAY simpler:

- PF_NOJUMPDAMAGE no longer affects height at all (you're welcome katsy).
- Characters with SF_NOJUMPSPIN will only use spinheight when panim is PA_ROLL. They cannot enter gaps when jumping with spinheight, unless also spinning or gliding.
- All other characters use spinheight when panim is PA_JUMP or PA_ROLL. They can enter gaps when jumping with spinheight.