Revise and improve fully printed exhaust valve

[stephen304]

Pass 1

• Increased the size of holes for better airflow
• Added cutout to decrease the sealing surface contact area to reduce sticking from moisture, reduces the force required to open the valve
• Realigned inlet plate so it has less chance of sticking out
• Added divot around the inlet plate hole to allow cutting the tape without risking damage to the diaphragm
• Added spiral exhaust tubes to help lengthen the exhaust airpath and lower the risk of backflow
• As a result, no longer needs supports when printed

Pass 2

• Added test results table to document component testing
• Added more specific assembly instructions
• Add approximate print time to valve comparison table

Pass 3

• Reduce knob fillet radius to reduce overhang for support-less printing
• Increase knob cutout radius for comfort
• Change inlet plate <-> valve body mating surface to angled to avoid diaphragm getting stuck

[scottyallen]

LGTM!