Added the visuals for items after they ignite. Only ignition source is due to explosions so far. Not sure if the Activation Energy for items should be lowered, but if it is too low then the whole dungeon will ignite.
Wood materials, Balsa wood up to and including ebony wood, can now burn (interaction flags in material.dat have been updated to include CAN_BURN).
In this commit, it seems the random boot or gauntlet in a wished pair is no longer burning, so that provisional bug is provisionally fixed. (see changes to object.h)