Remove some more code that forced pointers into a long int, and
vice versa where information could be lost (P64 platforms such as
WIN64 have a 64 bit pointer size, but a 32 bit long size.)
This 2nd part deals with timeout functions switching
some arguments from type genericptr_t to 'anything'.
Like part 1, this needs to increment EDITLEVEL in patchlevel.h.
add a new melt_ice_away timer for ice created via zapping
a wand/spell of cold.
Some follow-up adjustments to the length of time before
the ice melts may be necessary. Ideally, I'd like to
have it so that the shorter the length of time since
the ice was created, the lesser the chance that it will
melt out from under you. Likewise, the longer it has
been, the more risky it will be to venture onto it.
At the moment, however, each spot of ice is just
getting a somewhat random time always greater
than 50, which is less than ideal.
