update cinema2state to work with python3

[dhrogers]

Trying to use cinema2state, but it appears to have trouble under python3.

Not critical, but it should be on the list.

[dhrogers]

In particular, this should be updated to work with the render.state state in the dev branch's WitU example. It appears that there are issues with both Python3 update and some clauses in the render.state we are using.