Have Mobs Ignore OP'd and Creative Players

[EchocallingEarth]

Add an option that would allow OP'd players to be ignored by mobs (Sort of like Spectator mode). This would prevent mobs from spawning around OP'd players or those in creative mode. This would allow OP'd players or those in creative to work without Mobs spawning near them, It would further allow OP'd players who may not use beds to sleep to be around normal players without attracting mobs to that player due to not sleeping.

Sorry, if my description is lacking.
If I can provide more on this idea please reach out to me here or in discord EchocallingEarth#0001

[RhythmicSys]

Added in 5b1c2b1
Build #1768