What changed in EDuke32, build by build

Usage is from 3D mode only. When a sector (or wall) is committed to the clipboard, it (or the wall's sector) is saved, and is subsequently used when auto-aligning [;-ENTER] another sector's ceiling or floor against the reference one's. This temp. sector is reset on any structurally modifying operation except setting first walls; also, aligning extended ceilings or floors is impossible as they use .*xrepeat internally. The auto-alignment does not change picnums (this can be accomplished with the ['+ENTER] combination), but copies the orientation bits 2^{2..6} to the alignee. Afterwards, if the reference is relative-aligned, it tweaks them, so that every case where the two firstwalls are either parallel or perpendi- cular is handled correctly. It does not yet calculate the panning values.

Also factor out the code (2x) setting the alignment bits for sprites.

We were writing into a string literal. Ouch!

This checks for about every possible type of sprite list corruption and reports back with a corruption level 5 if one of the 14 validations fail.

The reason was that drawmasks(), which was where the resetting of the fake RoR textures happened under Polymer, can be called from polymer_displayrooms() when mirrors are present. I was assuming that drawmasks() was only ever called after the 'main' drawrooms and that hence the sequence of fake RoR tile tweaking was set, reset, set, reset, ... which it was not. Now, do the resetting explicitly after every drawmasks() in the editor.

The implementation uses the recently introduced updatesector_onlynextwall when setspritez fails.