Move `private` methods to bottom and make `static` where applicable
Move `private` methods to bottom and make `static` where applicable

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