#21 Latch Component

[Brian G VanBuren]

Provide latch register (aka if clocked this cycle, assign a value, should treat as clocked component.

Also, provide SR latch, not(SR) latch, D latch, SR flip flop, T flip flop, JK flip flop, and D flip flops. These are helpful since they cannot be implemented at a lower level due to the one level pass simulation per clock.