[CF-Devel] Secret door images.

[Mark Wedel]

 If anyone has played using the png images as we currently ship and wonder
around the starting town, you will notice the 'secret' weak wall to the north of
the prison sticks out like an apple in a bunch of oranges.

 This is because while most of the cwall images were redone to have textured
stone looking walls, the weak walls was not.  For the xpm set, it appears
slightly different if you look closely, a few pixels are different compared to
the other walls.

 In this particular case, you can chalk it up to not having update png image
yet.  But since the client is responsible for drawing the images, a client can
always have more obvious images for things like weak walls.  So to me, there are
two possible fixes for this:

 1) When the wall is yet to be damaged, it uses the same image (name & number)
of an undamaged normal wall, so is completely indistinguishable from the normal
walls.  For this to properly work, other clues about the existance of such weak
walls is needed (For example, magic mouths which say 'you feel a draft' or 'Some
of the walls around here appear pretty weak'.  Also, clues on npc's or scrolls
would work.

 2) If the walls are supposed to be noticable from only visible inspection, then
this should be something more obvious than just a couple pixels being out of
place - for example, there should be cracks in the wall or other more apparant
damage that the wall could be destroyed than needing to pay really close
attention to walls and making sure there is not any changes.  Otherwise, you
will probably get a greater proliferation of clients that use their own images
for weak walls simply so the player can notice them.

 Thoughts/preferances?