Inline GetBattlerPartyData into its callers because its name is
confusing and we couldn't think of a better one.
This seems to fix a bug in one place where GetBattlerPartyData was being
used as if it had GetBattlerParty semantics.
-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.
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.
- Added a general GetBattleFormChangeTargetSpecies instead of getting specific ones for Mega Evolution and Primal Reversion.
- Added FORM_CHANGE_BATTLE_HP_PERCENT, to replace ShouldChangeFormHpBased.
- Cleaned ifdefs for hold effects.
- Finally removed UndoMegaEvolution.
- FORM_CHANGE_FAINT and FORM_CHANGE_BATTLE_END restore to the first form before a battle form change if species isn't specified.
- When changing from a form with more HP to one with less, now current HP is kept to fix Zygarde edge case. (Will likely need to be reworked for Dynamax, as it behaves differently)
- Uses DoesSpeciesUseHoldItemToChangeForm in CanBattlerGetOrLoseItem.
-Moved it to src/pokemon.c
-Made a battle specific variant called GetBattlerFriendshipScore.
-Made that variant return 0 for Mega Evolved 'mons and if called on link battles.
1. Refactor Perish Song
2. Yawn
3. Secondary Damage (Leech Seed, Cursed etc).
4. Added Preliminary logic to help AI be smarter against semi-invulnerable
Added AI logic regarding abilities that benefit from switching
1. Natural Cure
2. Regenerator
