IDE preferences don't persist.

[mikeal]

If you set a preference in the IDE like using JSON instead of Python for your tests, that preference doesn't persist the next time you bring up windmill.

For this ticket, the service needs to implement a method named, save_preference. The keyword arguments passed in to it will be persisted in a dictionary and when windmill loads the IDE the service will call setOptions and send all the keyword arguments it has saved locally.

[mikeal]

Bear is gonna write a method to persist prefs. Then assign it to me and I can write the service call, then I'll assign to adam to handle the IDE work.