Session improvements

Hey Internals, I have been thinking about / working on a couple of session improvements. This work started once I had the time to fully read the "Precise session data management" RFC. I was thinking about creating small and specific RFCs for specific issues to be discussed. I planned to put this up in the coming week(s). Most of the work isn't yet ready for prime-time, but I have already discussed it with a couple of people. However now that I see the discussion about the last sessions RFC is being brought up again I thought I would give you all a heads-up that there are more people working on improving sessions. There will be minor overlap with Yasuo's session RFC hence I speak out now. Pieter