Reduce uuid usage

The fast majority of the cases only need a locally unique id and not a universally unique id as they are never serialized or imported. Using a counter in those cases would likely be faster than generating a random number. It may also allow reducing the size from 128bit to 64bit. There are a couple of user facing uuid's like type uuid's that actually need to be universally unique. For them we should keep using uuid's or consider switching to random 128bit integers that are not necessarily valid uuid's.