Changelog

1.1.0 (in progress)

Implement discrete time systems using events.
- Since systems with discontinuities should have been continuous-time anyway, the dt argument to the numeric SwitchedSystem constructor was removed.
- The argument rules for event_equation_function and update_equation_function during integration now follow output_equation_function and state_equation_function, respectively.
- No longer allow non-zero t0 for simulate;