[ticket/12721] Add Generic.Files.LowercasedFilename in the legacy ruleset

PHPBB3-12721
[ticket/12721] Add Squiz.Arrays.ArrayBracketSpacing in the legacy ruleset

PHPBB3-12721
[ticket/12721] Add Generic.Functions.OpeningFunctionBraceBsdAllman

PHPBB3-12721
[ticket/12721] Add Squiz.ControlStructures.ElseIfDeclaration in legacy

PHPBB3-12721
[ticket/12721] Add Squiz.ControlStructures.ForEachLoopDeclaration

PHPBB3-12721
[ticket/12721] Add Squiz.ControlStructures.ForLoopDeclaration in legacy

PHPBB3-12721
[ticket/12721] Add Squiz.Functions.LowercaseFunctionKeywords in legacy

PHPBB3-12721
[ticket/12721] Add Generic.NamingConventions.ConstructorName in strict

PHPBB3-12721