* Add example for next_event[n] operator
* Add formal test for next_event[n] operator
* Add next_event[n] to supported list
* Add next_event_a[n] & next_event_e[n] to unsupported list
* sequencer for easy waveform generation of
simple 1 bit std_logic signals
* Package with sequencer component delaration
* Examples for always & never operator