Keep: SingletonのNULL判定処理の削除
Patchunicode#668


git-svn-id: svn://svn.code.sf.net/p/sakura-editor/code/sakura/trunk2@3347 f7ce1907-e4c7-47ca-9f76-12c87ed2c91c
Keep: Singletonの実装変更
Patchunicode#618


git-svn-id: svn://svn.code.sf.net/p/sakura-editor/code/sakura/trunk2@3348 f7ce1907-e4c7-47ca-9f76-12c87ed2c91c
Keep: tstringの参照渡し
Patchunicode#662


git-svn-id: svn://svn.code.sf.net/p/sakura-editor/code/sakura/trunk2@3349 f7ce1907-e4c7-47ca-9f76-12c87ed2c91c
Keep: プロパティシート作成処理整理
Patchunicode#669


git-svn-id: svn://svn.code.sf.net/p/sakura-editor/code/sakura/trunk2@3354 f7ce1907-e4c7-47ca-9f76-12c87ed2c91c