feat(util/name): use '.' instead of '::' as hierarchical name separator
feat(util/name): use '.' instead of '::' as hierarchical name separator

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

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