SVN handles and Git names are merged into one person.
implement horiz. tex panning for sprites (spriteext[].xpanning).
Known as getactor/sprite[].xpanning from CON, values are 0-255. It should be assumed that this is only valid for wall-aligned sprites (currently, face sprites also pan). A test is provided in lunatic/test/animatesprites.con. It should be run in E1L2 and only with the Lunatic build.
prevent a SIGFPE when attempting to draw p'lax with nonexistent tile.
fix oob read of frame buffer when leftmost vline has a mirror.
In the mirror reversing code, get rid of the padding. This may produce seams, but they appear to be extremely transient and shouldn't be noticeable. In game.c, add a debugging compilation switch DEBUG_MIRRORS_ONLY.
optimize background 'rainbow' drawing in use for editor/debug.
Also, draw it at shade 18 and don't use fullbright colors.
clean up mirror drawing code.
No functional changes, but a (commented out) debug line for an oob read of the frame buffer when the mirror covers the whole screen is inserted.
