Mimicry is now a proud member of ABILITYEFFECT_ON_TERRAIN.
Misc. changes:
-Ditched the dependency on and usage of gBattlerAttacker for the effects inside ABILITYEFFECT_ON_WEATHER and ABILITYEFFECT_ON_TERRAIN.
-Made Cmd_switchineffects activate ABILITYEFFECT_ON_TERRAIN to take into account overworld weather-induced field terrains.
-Updated the text strings printed by the battle scripts inside the aforementioned AbilityBattleEffects caseIDs.
-Removed constant label of unused VARIOUS_TRY_TO_APPLY_MIMICRY which I forgot about.
-Updated ChangeTypeBasedOnTerrain, partly as a result of the aforementioned changes but also for optimization purposes.
-There was never a reason to establish an empty scope, or to use GET_MOVE_TYPE and the variables that complemented it.
-Removed case ABILITY_QUARK_DRIVE from AbilityBattleEffects' case ABILITYEFFECT_ON_SWITCHIN.
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