Atomic_Dave Does: Redstone! Mob Farm flushing clocks, Java 1.15

Dave does 2 different redstone clocks used to flush mob farms for Java 1.15 including a repeater clock and a hopper clock, with options for on/off switches.

#minecraft

[__nicfit__]

It seems that the delay for allowing spawning should be longer then the pulse that retracts the water.