fix field serialization ordering
fix field serialization ordering

FsUnity/Unity3d.FsPickler,haraldsteinlechner/FsPickler,wallymathieu/FsPickler,nessos/FsPickler,nessos/FsPickler,FsUnity/Unity3d.FsPickler,mbraceproject/FsPickler,cloudRoutine/Unity3d.FsPickler,wallymathieu/FsPickler,haraldsteinlechner/FsPickler,cloudRoutine/Unity3d.FsPickler