Quest dialogs: stay centred, clickable, closable with Esc

- Quest dialogs are tooltips. A tooltip now keeps the offset it gets when it
  becomes visible (the hovered window's, or centred for dialogs) and records
  it for hit tests; its own event handler is shifted too. Hidden windows no
  longer count as hovered.
- Esc closes a visible dialog the way its answer buttons do: hide, then
  cDialogManager::Answer with no answer (ends the input lock, nothing chosen).
- Autotest can select a save game row (-Save).
- Names for the UI manager, tooltip and dialog functions.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

tools/names.txt

@@ -167,3 +167,10 @@
 0x00536f20 cCreature::DistanceTo           # (object id)
 0x00ad1c60 g_nearbyCreatures              # {object id, ?} x g_nearbyCreatureCount, creatures near the player
 0x00ad1b48 g_nearbyCreatureCount
+0x0049a090 cDialogManager::Answer          # (owner, answer): cEvent_creature 0x10c to all heroes (ends the dialog lock); answers < 100000 -> quest script 0x46bd80
+0x006e7120 cUI_Tooltip::HandleEvent        # dialog answers: click on an entry (+0x2188 list) -> hide, cDialogManager::Answer
+0x0075a870 cUI_Manager::TooltipCreate      # a panel from the pool at +0x124
+0x00756ba0 cUI_Manager::HandleEsc
+0x00731ee0 cUI_Control2::ClearFlags        # (flags): bit 0 = visible (hide)
+0x00aaaf00 g_dialogManager
+0x006360e0 cRecordCache::Get              # map at +0xde5c, LRU (see docs/performance.md)