SVN handles and Git names are merged into one person.
fix underallocation of TILE_TILT and tilting at very small resolutions.
Since TILE_TILT is only allocated once, it must be done with the maximum possible size.
on desktops, handle abs. z diff. of floor/ceiling to camera >= 1<<24.
fix "windowed" modes (r_size >= 12) by reverting r4920; adapt.
In setview(), we now assert windowx2 < xdim. The only calling places where its non-violation is non-trivial to ascertain are (1) showview from CON and (2) draw-to-tile for look-sideways in game.c. AFAICS case 1 should be fine. Case 2 is adapted; see comments there.
