Better compensate Crypt's spawns for the cut floors

Better compensate Crypt's spawns for the cut floors

Since there used to be some key spawns left to Crypt:3 when it had five
floors, adjust everything up a floor to better approximate what it once
had (so, current Crypt:1-3 will resemble previous Crypt:2-4). It does
mean the branch gets meaner faster, but the cap of meaness was cut off.

Still, the out-of-depths are a nice idea, since few branches actually have
such a possibility. I'm keeping it with an altered simulation of what
a previous Crypt:6 would have been, though with a bit of difficulty and
some editing due to how monster weighting functions are mostly regulated
according to the branch's length. No ood wraiths, some ood phantasmal
warriors / jiangshi / silent specters / ghouls, lowered ood chance for
ancient champions (from what would be 15%!). Outside of some minor changes
to wraiths and ghoul spawns (rather compensated with ood / respawns), the
margin of change should be 0.05% for Crypt:1-3 regular spawns, and 0.1%
for Crypt:4 (or old Crypt:5); this was done via spreadsheet rather than
simulator or formula. Whatever.