Written stupid procedural stat1 module. It works for now and gathers the majority of the statistics I want. Nice functional/OO version suspended for now, until more research is done.
Fixed circle references in gamelogs into weakrefs.
Started extracting general helper functions into util module.
Added collection of hand states, made calls and riichi states into rounds.
Made basic DrawType and HandState enums.
Added tracking of gained/lost points and tenpai state for drawn rounds.