feat(library/data/set): add distributivity, diff, uniformize with finset
feat(library/data/set): add distributivity, diff, uniformize with finset

fpvandoorn/lean2,fpvandoorn/lean,leanprover-community/lean,dselsam/lean,digama0/lean,fgdorais/lean,soonhokong/lean,Kha/lean,fpvandoorn/lean2,fpvandoorn/lean,levnach/lean,htzh/lean,leanprover/lean,Kha/lean,rlewis1988/lean,c-cube/lean,digama0/lean,soonhokong/lean,fpvandoorn/lean,UlrikBuchholtz/lean,fpvandoorn/lean,leanprover-community/lean,fpvandoorn/lean,leodemoura/lean,javra/lean,javra/lean,soonhokong/lean-osx,javra/lean,dselsam/lean,htzh/lean,dselsam/lean,leodemoura/lean,johoelzl/lean,fpvandoorn/lean2,fgdorais/lean,leanprover/lean,soonhokong/lean-windows,fpvandoorn/lean2,soonhokong/lean,leanprover-community/lean,UlrikBuchholtz/lean,javra/lean,soonhokong/lean-windows,Kha/lean,johoelzl/lean,fgdorais/lean,soonhokong/lean-osx,avigad/lean,avigad/lean,sp3ctum/lean,digama0/lean,soonhokong/lean-osx,Kha/lean,c-cube/lean,eigengrau/lean,rlewis1988/lean,rlewis1988/lean,avigad/lean,johoelzl/lean,rlewis1988/lean,leanprover-community/lean,fpvandoorn/lean,UlrikBuchholtz/lean,leanprover/lean,fgdorais/lean,Kha/lean,leodemoura/lean,avigad/lean,levnach/lean,leanprover/lean,leodemoura/lean,levnach/lean,htzh/lean,soonhokong/lean-windows,soonhokong/lean-windows,rlewis1988/lean,fgdorais/lean,soonhokong/lean,UlrikBuchholtz/lean,UlrikBuchholtz/lean,dselsam/lean,sp3ctum/lean,soonhokong/lean-osx,htzh/lean,johoelzl/lean,soonhokong/lean,leanprover-community/lean,digama0/lean,fgdorais/lean,johoelzl/lean,leanprover/lean,digama0/lean,c-cube/lean,sp3ctum/lean,digama0/lean,rlewis1988/lean,dselsam/lean,eigengrau/lean,leodemoura/lean,levnach/lean,leanprover-community/lean,johoelzl/lean,leanprover/lean,c-cube/lean,leodemoura/lean,soonhokong/lean-windows,Kha/lean,htzh/lean,eigengrau/lean,avigad/lean,soonhokong/lean-osx,eigengrau/lean,eigengrau/lean,dselsam/lean,javra/lean,levnach/lean,c-cube/lean,sp3ctum/lean,avigad/lean,sp3ctum/lean,fpvandoorn/lean2