Method to get all forces currently set (or at least clear them)

[RLesser]

I'm working on something where I'd like to be able to see all the currently set forces on a simulation. This information is stored in the forces map, but this isn't accessible through any method. Would it be possible to add a forces() method that returns that map, or a list of the defined forces?

Alternatively, some way to clear all current forces from a simulation would also satisfy this goal.

Would love to hear thoughts on this!