go: port item effects — potions, scrolls, options, call_it

- potions.c completed: quaff with all 14 potion effects, the PACT
  standard-fuse table (do_pot), raise_level; the see-invisible fruit-
  juice message is computed at quaff time as in C
- scrolls.c in full: read_scroll with all 18 scroll effects including
  the magic-mapping map rewrite and identify dispatch, uncurse
- options.c in full: the interactive options screen, get_bool/get_str/
  get_inv_t/get_sf editors, ROGUEOPTS parsing (prefix matching, no-
  prefixed booleans, ~ expansion), strucpy
- misc.c call_it via the get_str line editor
- turn_see gets a DaemonID (C casts it to a fuse callback for the
  monster-detection potion)

Tests: healing/confusion potions with fuse burn-down, enchant armor,
hold monster, slow-monster zap, ROGUEOPTS parsing, and a regression
test documenting the C wake_monster ISGREED/ISHELD quirk the port
keeps faithfully.

game/daemons.go

@@ -30,6 +30,8 @@ func (g *RogueGame) runDaemon(id DaemonID, arg int) {
 		g.comeDown(arg)
 	case DLand:
 		g.land(arg)
+	case DTurnSee:
+		g.turnSee(arg != 0)
 	default:
 		// Callbacks are added to this switch as their subsystems are
 		// ported; reaching one that isn't here is a porting bug.