- CCLP1 #81 requires pushing blocks off of blue walls, which is
impossible in CC2 but allowed in TW Lynx (unclear if this is a lynx
behavior or a tw bug)
- CCLP1 #89 has a tank start on a recessed wall and drive off of it,
expecting the recessed wall to be left alone, but under CC2 rules it
becomes a wall; such walls are now automatically converted to a new
tile, the "doubly recessed wall", which restores the expected behavior
without changing how recessed walls work in general
- CCLP4 #135 expects pressing a blue button to not affect blue tanks
that are currently in mid-slide
In addition, the behavior of blue buttons now matches the Lynx/Steam
behavior: the press is stored as a flag and queued until the tank is
next able to move.
