Revert "Expose List.Enumerator directly in SortedList."
Revert "Expose List.Enumerator directly in SortedList."

This reverts commit 20095fdfb69e64fb18e418b439eff9b8fe68f22e.

EVAST9919/osu-framework,ppy/osu-framework,ZLima12/osu-framework,ZLima12/osu-framework,EVAST9919/osu-framework,EVAST9919/osu-framework,smoogipooo/osu-framework,EVAST9919/osu-framework,ppy/osu-framework,peppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,ppy/osu-framework,peppy/osu-framework