Json, added protected method to allow customizing field order.
Json, added protected method to allow customizing field order.

stinsonga/libgdx,Zomby2D/libgdx,Zomby2D/libgdx,Zomby2D/libgdx,libgdx/libgdx,libgdx/libgdx,NathanSweet/libgdx,cypherdare/libgdx,cypherdare/libgdx,tommyettinger/libgdx,NathanSweet/libgdx,stinsonga/libgdx,libgdx/libgdx,stinsonga/libgdx,bladecoder/libgdx,libgdx/libgdx,tommyettinger/libgdx,stinsonga/libgdx,tommyettinger/libgdx,NathanSweet/libgdx,Zomby2D/libgdx,cypherdare/libgdx,cypherdare/libgdx,bladecoder/libgdx,cypherdare/libgdx,tommyettinger/libgdx,bladecoder/libgdx,libgdx/libgdx,Zomby2D/libgdx,NathanSweet/libgdx,stinsonga/libgdx,NathanSweet/libgdx,tommyettinger/libgdx,bladecoder/libgdx,bladecoder/libgdx