Remove some Minor Healing

Norris's: he's a death cultist, not a healer!

Wizards': It fit their theme back when 'holy' was a spellschool,
but it ain't now, and it isn't particularly useful for them now.

Dowan's. 2d1.
Make Norris follow the one true god

GOD_NAMELESS.

Very silly for a 'death cultist' to be casting spells like a
wizard!
Unionize

Change a number of item fields to use unions, in the interests of
readability/sanity. All uses of plus2 are enumerated; plus and
special are only partially enumerated. Someone should probably
do a second pass, at some point.

Also removes a few archaic uses of plus2, e.g. its use in
randbook generation, which had been obsolete since 86acd0ce5263,
and adds a function for checking if a wand is known to be empty.
(Sorry, that one should be in a separate commit - too hard to
separate out now...)
A pile of vaults from various authors (#8862, #9036, #9101).

Changes:

cheibrodos_lair_reptile_den: move the black mambas to the 2 glyph.

cheibrodos_magma_flow: lava worms no longer exist; replaced with lava
snakes.

cheibrodos_lair_caveside_slide: nuked the SHUFFLE that broke
connectivity, adjusted the SUBST: to match, and removed the now-unused -
glyph.

cheibrodos_spurs: removed the extra 0 placement; having the enemies
place in bands probably makes this sufficiently threatening.

kennysheep_kobold_grotto: killed the neutral halflings (they're corpses
now).

kennysheep_(vaults_)gozag_temple: added a uniq_ tag so that only one
appears per game; halved the greed of the shops, but limit the number
of items in each shop to three; decoloured the glass; coloured the
statues; removed entry-by-stairs (it is a gimmick that has been overdone
and is aggravating).

nicolae_ru_great_annihilating_truth: remove the monster from the altar
and shuffle it into one of the four external monster slots instead.

nicolae_ru_awakened_eye: per author, change the iris to shallow water
to distinguish it from the outer eye.
Cleanup (Grunt, |amethyst)

Unused variable, variable with shadowed name, weird field sizes.
Further de-warning.

<PleasingFungus> Grunt: remove it yourself!!!
Add a spooky surprise!

Tile is credit (Bloax). Grunt & gammafunk also helped!
Fix another warning.
Unbrace.
New rapier tiles.
Move old cutlass tiles to UNUSED.
Restore summon poofs.

Oops.
Don't place monsters on top of the player (9019)
Fix skeletal frog prince ribbit (mattybee)

With some ugly hacks. :(

Better solutions welcomed
Remove Dowsing from the deck of battle (hangedman).
Remove the Metamorphosis card (hangedman).

"Metamorphosis is bad for most characters due to unarmed focus. At the
very least, most characters really don't appreciate spider form or blade
hands when drawing randomly. You can cancel it, which means you've used
up two turns and a card for nothing."

There are some ideas for improvement, but for now, no point in torturing
players (especially ones who don't realise the quite hidden fact that it
was cancellable).
Simplify.
Remove some #ifdef WIZARDs.

WIZARD is set to true by default; perhaps these could have been changed
to be if (wizard), but are we _really_ concerned about an info leak?
Especially if it makes bug reports less clear?
Make decks evokable from inventory.

<LinleyH> dpeg: do you still have to wield cards to use them?
<LinleyH> dpeg: that was a mistake.

Needing to wield made decks quite a bit less attractive for non-Nem
characters, and for Nem ones, made drawing a card 3 keypresses instead
of 2. There was the MP cost, but in practice it mattered very little.
Remove Draw One.

Since it's now useless.