Adding SMG model checker to payntbind

[TheGreatfpmK]

Adding a taken implementation of SMG model checker from TEMPEST (https://github.com/PrangerStefan/TempestSynthesis) to payntbind.
This model checker works on the Smg class from Storm, which holds general turn-based SMGs. Therefore, this model checker should be future-proof if we would like to play around with more than two players and so on. I only tested reachability properties! See how to specify the rPATL properties here: https://prismmodelchecker.org/games/properties.php. Note the player indexing starts from 0 for the players i.e. Player1's index is 0. The results are the same as those of PRISM-Games.

I added a binding "smg_model_checking" which expects the SMG and formula to be checked, and returns a model checking result with values for each state and a scheduler.

I also changed the models in models/posg to the new DRN format that we can export from PRISM-Games thanks to Dave. For now I kept the old POMDP models there as well, but we can remove it once we verify the parser.

Depends on moves-rwth/stormpy#173