-Foolproofed the ability checks in ABILITYEFFECT_ON_WEATHER and ABILITYEFFECT_ON_TERRAIN
-Made BattleScript_OverworldWeatherStarts and BattleScript_OverworldTerrain call the battle scripts that handle weather form changes, weather abilities, terrain seeds and terrain abilities.
-Consequentially, I removed the activation for weather and terrain abilities that I added to TryDoEventsBeforeFirstTurn, and the activation of Protosynthesis in ABILITYEFFECT_ON_SWITCHIN.
-Added a weatherAbilityDone to prevent abilities that lack self-checks like Protosynthesis from getting stuck in a loop.
-Removed now pointless ABILITYEFFECT_WEATHER_FORM. I think Duke/Sneed69 added it to fix Castform's form change, but it no longer serves a purpose.
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