Migrate existing rules to PSSA2

PSSA2 should support most or all existing PSSA rules. Some rules may be inappropriate for continued use and others may need to be expanded, but gradual migration of rules should be possible.

Dependencies on Helper methods should be replaced with general purpose implementations that live under the appropriate class and injected into rules at instantiation time.

Some rules may need refinement or improvement, particularly in name or implementation. When this is done, a mechanism should be provided to improve compatibility.

まず、既存の PSSA ルールと Helper methods への依存関係を洗い出し、次に PSSA2 がどのようにルールをインスタンス化するかを比較します。移行可能なルール、汎用実装を配置すべき場所、名前変更または改良されたルールの互換性をどのように維持するかを定義します。