Mind Blown targets all users and was triggering recoil every time it hit. Changed so that it only applies once after all targets take damage by adding a new MoveEffectTrigger, POST_TARGET. This also fixes an issue where dying to recoil stopped the rest of the damage from hitting the remaining targets.
This change also applies fixes for Steel Beam since they are have the same effect but is single target.
Also added missing messages for Damp and Recoil. All messaging is in line with Pokémon Showdown.
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