What changed in EDuke32, build by build

Fix OOB access

Use a 16-gon instead of an octagon if an ART sky has >8 panels

Fix smoothness of q16 mouse aiming

Address an oversight in r4600.

Correct an oversight in r3580.

Revert part of r5481. We can't rely on the sprite trackers to tell us when tsprites change.

Fix the oversight in handling tspr->extra from r5400 by setting it to zero in polymer_scansprites.

Account for HICTINT_APPLYOVERALTPAL and HICTINT_USEONART.