Remove a bogus character escape.
Fix "a" frost-covered floor.

That capitalization wasn't a typo.
Unsplit an URL.

I do need to scroll to copy it in chunks (or cat it first), but that's
hardly any more work when it's in one piece as compared to being chopped.
Those with a GUI editor, on the other hand, can now click it directly.

Also, write those accents in random directions inline -- I don't think
anyone these days can be expected to have problems with non-ASCII.
Re-add the seemingly unused copy of Zonguldrok's lich definition.

It's needed for gather_mons (db_lint, listing monsters) and for Gretell's
"monster"; hard-coding it in the former would be easy, in the latter not
so much.
Uncolour permaglass in the Cloud Mage wizlab.
Drop unused feature descriptions.
Initialize invis_fd and cloud_fd in the code rather than statically.

They're non-const and get amended already.
Remove more Lair runed doors

Neither of these need to be runed: they're right in the middle of the end
vault, so unlikely to be autoexplored into, and it's possible to just
close the door and walk away again if you don't feel like dealing with
an anaconda/dragon.
Fix Ziggurat default-depth
Fix a sporadic error in validating the frog pond.

There might not be a | glyph to check connectivity to, but there will
always be a d.
Handle invalid login cookie more gracefully
Annotate ranged and melee weapons for search

Instead of {weapon} it's now either {ranged weapon} or {melee weapon}.
Throwable weapons, magical staves etc. are not included.
An attempt to improve the Ctrl-F help screen.
Arenasprint fixes (#7823)

Fix a reference to D:19 and some out-of-date comments.