Add support to latest CPLEX versions

[lkluc]

Hello,

I would like to give a try to this framework, however, the latest CPLEX version supported by FLIPS seems to be 12.8 !

Although Optano has a long list of other supported solvers...

https://docs.optano.net/modeling/current/userDoc/supportedsolvers.html

...my focus is in having the versions 12.10 and 20.1.0 of CPLEX supported (and any other newer CPLEX versions).

Can you add these versions to FLIPS supported versions ? If it's not too much trouble, it would be nice also to keep a choice of older solver versions to be able to test, benchmark and/or revert to.

Thanks in advance !