Refactor ESSOptimizer options

[dweindl]

Replace the current ESSOptimizer init args by class ESSOptions. This will simplify the interface and leave only a single point to document the options.

Update: After modularizing the code, it might make more sense to set the options directly on the individual components. This avoids having dead options if some part of the algorithm is replaced. E.g. set options directly on class RecombinationStrategy, ...