Adding ability effect triggers for terrains and weather

A new, probably better way to handle the announcement trigger that abilities such as Protosynthesis and Quark Drive have, when the battle weather or the field terrain change.

Misc. changes:
-EFFECT_DAMAGE_SET_TERRAIN -> EFFECT_HIT_SET_REMOVE_TERRAIN
 -It's more appropriate as the effect can be used to force set a terrain or simply to remove an active terrain, after all.
 -The main reason for the rename was the inconsistency with the battle script's label.
-Reverted accidentally committed change to B_DOUBLE_WILD_CHANCE, performed back in c8abf00c.

asm/macros/battle_script.inc

@@ -2010,6 +2010,14 @@
 	.4byte \ptr
 	.endm
 
+	.macro activateweatherabilities battler:req
+	various \battler, VARIOUS_ACTIVATE_WEATHER_ABILITIES
+	.endm
+
+	.macro activateterrainabilities battler:req
+	various \battler, VARIOUS_ACTIVATE_TERRAIN_ABILITIES
+	.endm
+
 @ helpful macros
 	.macro setstatchanger stat:req, stages:req, down:req
 	setbyte sSTATCHANGER, \stat | \stages << 3 | \down << 7