Give corrosive bolt to monsters with Random Bolt as well.

Unifies the codepaths for picking which bolt between direct casting
and rod evoking, to make this easier.
Repurpose the old brown ooze tile as a standard ooze
fix identifying the last item of a type (PleasingFungus)
oops, fix rings
Fix doxygen comments.

doxygen needs a < after the docstring indicator if the comment follows
the commentee.
Refactor player web escapes
Add hydra form to polymorph effects

As an extremely rare easter egg, like dragon form.
Tweak lightli_temple_of_fire

Don't spawn monsters on the 1-tile blood-fountain alcoves
separated by lava from the actual room.
Unbrace
Refactor last-item ID
Staticify (Grunt)
Disable fo digging/shafting in treeform (9024)

Possibly should be disabled in all major forms, but that feels
like an unecessary fo nerf. Will hold off for now.
Make felids hiss at enemies (9026)

Instead of meowing at them. (They still meow for attention.)

Regrettably, this means that felids players will never again see
"you meow your recitation at the foo".
Add a dummy Elf:2 vault for when Blade exists (#8984)

The other two PLACE: Elf:2 vaults vetoed in this case, meaning
we could never successfully generate the level when Blade existed.
De-head a hydra in a random monster list (#8989)

It doesn't work, and gives a warning.
Add weapon/shield offsets for MONS_MISSING_GHOST

I could hardly not support my own tile, now could I?
Clean out some unused tiles that have gotten better replacements.

There are three groups of tiles in this rltiles/UNUSED/monsters folder:
tiles of monsters that have never been, tiles of monsters that were removed,
and tiles that were replaced with significantly better ones on currently-in
monsters. I've trimmed the last group by far as it has the least reason to
be kept, with exceptions granted to the smaller pan/hell lord tiles and the
old orb guardian tile.

If anybody wanted to use any of those tiles, they can find them in the git
history alongside plenty of other tile replacements that didn't get preserved
so explicitly.
Clean up rltiles/UNUSED

Removed anything that I very strongly doubted would ever be used
or useful.

Also reorganized a couple of things.
Re-alphabetize monster descriptions