Complete rewrite of special node edit dialog

- Now has space for the additional fields that have been added.
- The dialog text has been updated so that labels, names, etc reflect all (or at least most) changes that have been made to specials so far.
- A lot more fields provide a Choose button than previously. A few of these are still unimplemented though.
- Rect specials have their own button now, instead of being filed under Town specials.
- New help button (not yet implemented)
- You can now cancel when deep into a node chain. You're given a choice of discarding the entire chain or just the current node; choosing the latter is similar to clicking "Go Back", but doesn't save your changes.
- Nodes are no longer saved prior to clicking OK (which saves all the nodes you were working on) or "Go Back" (which saves just the current node). So, choosing the first option when clicking Cancel could lead to a lot lost.
- Incidental change: The arithmetic special nodes now use the message 1 and 2 fields in the standard way.

Supporting dialog engine changes:
- Picture choice dialog now has a way to get the index of the selection, rather than just the picture selected.
- Picture choice dialog no longer sorts the list of pictures. If sorting is desired, the list should be sorted prior to passing it in.
- Picture and string choice dialogs now support attaching a "select handler" to be called when the selected item changes, because the normal way to do this would override the all-important focus handler that the dialog uses to track the currently selected item.

rsrc/strings/sound-names.txt

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+Lock Target / Noted in Journal
+Cancel Target Lock
+Edged/Bashing Miss
+Near-death Cough
+Bless
+Fire Explosion
+Eat Food
+Gain Level
+Alchemy Brewing
+Unlock Click
+Teleport
+Launch Magic Missile
+Fire Arrow
+Party Death
+Throw Missile
+Shop Purchase
+Enter Town
+Footstep Splash
+Enter Combat/Monster Alert
+Polearm Miss
+Resting Yawn
+Death
+Intro Jingle
+Outdoor Encounter
+Priest Spell
+Mage Spell
+Gremlin Steals Food
+Snuffling Growl
+Waterfall
+Human/Giant Death
+Human Death
+Beast Death 1
+Beast Death 2
+Goblin/Other Death
+LED Click
+Spider says "Hi"
+Spider says "Hello"
+Button Click
+Buy Item
+Get Gold
+End Shopping
+Action Failure
+Acid Hit
+Petrify
+Breathe
+"On whom?"
+Monster alert growl
+Footstep Crunch
+Row Boat
+Footstep 1
+Footstep 2
+Enchant Weapon
+Generic Spell Sound 1
+Magic Explosion
+Fear
+Poison Squish
+Drink
+Information Ding
+Open Door
+Close Door
+Fire Damage
+Summoning
+Get Food
+Ouch
+Spit
+Fear
+Starvation
+Monster alert "Huh?"
+Generic Spell Sound 2
+Small Sword Hit
+Large Sword Hit
+Polearm Hit
+Bashing Hit
+Flame Hit
+Launch Fireball
+Cold Hit/Haste/Slow
+Bird 1
+Bird 2
+Drip 1
+Drip 2
+Dog Bark
+Cat Meow
+Sheep Bleet
+Cow Moo
+Horse Whinny
+Footstep Horse
+Claw Hit
+Bite Hit
+Slime Hit
+Zap Hit
+Paralysis
+Bird 3
+Chicken Bawk
+End Combat
+Lever Click
+Enter Dungeon
+Sleep
+Normal Ouch
+Missile Hit
+No Sound