Removed Vanilla*::fromString()

these were misbegotten and should never have existed.
If someone really needs these for some reason, they can use getAll()[name].

src/entity/effect/VanillaEffects.php

@@ -109,10 +109,4 @@ final class VanillaEffects{
 		$result = self::_registryGetAll();
 		return $result;
 	}
-
-	public static function fromString(string $name) : Effect{
-		$result = self::_registryFromString($name);
-		assert($result instanceof Effect);
-		return $result;
-	}
 }