Simplified API by using shared pointers
Writing a complex optimal control problem can be very hard if the user needs to handle carefully all raw pointers. Paying this expensive lunch for just a bit of memory overhead (counter pointer) of shared pointers cannot be justified.
With this code, I ensure that we don't create runtime overhead.
Additionally, I simplified the unittest by using shared pointers. Please have a look of this code @mnaveau.
Finally, I have figured out how to expose custom data in Python. I included all these datas.
In conclusion this PR includes:
- Simpler API which uses shared pointers for abstracts (i.e. state, contacts, impulses, costs, actions, callbacks and shooting problem)
- benchmarks and unittest according 1.
- unittest code which uses shared pointers, removed custom management of memory
- exposition of custom data structures in Python