Generalize the special node types dealing with fields.

- IF_FIELDS (formerly IF_OBJECTS) can now deal with any kind of field (apart from special spots, which aren't technically a field but share some implementation details).
- The twelve RECT_PLACE_XXX field nodes (well, one of them was RECT_CLEANSE) have been collapsed into one, allowing the placement of any kind of field (apart from special spots). In particular, antimagic fields can now be placed! (There wasn't a node for them before.) As a bonus, since it exists in the field type enum, RECT_PLACE_FIELDS can also smash fragile wall terrains (like the Move Mountains spell).

osx/classes/simpletypes.h

@@ -662,7 +662,7 @@ enum class eSpecType {
 	IF_HAVE_ITEM_CLASS_AND_TAKE = 145,
 	IF_EQUIP_ITEM_CLASS_AND_TAKE = 146,
 	IF_DAY_REACHED = 147,
-	IF_OBJECTS = 148,
+	IF_FIELDS = 148,
 	IF_PARTY_SIZE = 149,
 	IF_EVENT_OCCURRED = 150,
 	IF_SPECIES = 151,
@@ -700,18 +700,18 @@ enum class eSpecType {
 	TOWN_TIMER_START = 195,
 	TOWN_CHANGE_LIGHTING = 196,
 	TOWN_SET_ATTITUDE = 197,
-	RECT_PLACE_FIRE = 200,
-	RECT_PLACE_FORCE = 201,
-	RECT_PLACE_ICE = 202,
-	RECT_PLACE_BLADE = 203,
-	RECT_PLACE_SCLOUD = 204,
-	RECT_PLACE_SLEEP = 205,
-	RECT_PLACE_QUICKFIRE = 206,
-	RECT_PLACE_FIRE_BARR = 207,
-	RECT_PLACE_FORCE_BARR = 208,
-	RECT_CLEANSE = 209,
-	RECT_PLACE_SFX = 210,
-	RECT_PLACE_OBJECT = 211, // place barrels, etc
+	RECT_PLACE_FIELD = 200,
+	UNUSED2 = 201,
+	UNUSED3 = 202,
+	UNUSED4 = 203,
+	UNUSED5 = 204,
+	UNUSED6 = 205,
+	UNUSED7 = 206,
+	UNUSED8 = 207,
+	UNUSED9 = 208,
+	UNUSED10 = 209,
+	UNUSED11 = 210,
+	UNUSED12 = 211,
 	RECT_MOVE_ITEMS = 212,
 	RECT_DESTROY_ITEMS = 213,
 	RECT_CHANGE_TER = 214,