Add new logging type: "Admin only"

[iViscosity]

This is a solution to #15, which has been a suggested (and planned) feature since 2013.

This is entirely untested, as I have no current way of testing this, so please let me know if it works.

Current settings (from Stickly Man!'s post):

; Echo modes:
; 0 - OFF No output to any players when an admin command is used
; 1 - ADMINS Output to admins only.
; 2 - ANONYMOUS Output to players without access to see who used the command (admins by default) similar to "(Someone) slapped Bob with 0 damage"
; 3 - FULL Output to players similar to "Foo slapped Bob with 0 damage"

[zpetty33]

My only issue with this, is that you changed option 1 to the new option, instead of adding it to the end. This would completely break current installations of ULX. Well.. break is a harsh term, but it would change the behavior for everyone instead of giving them the opportunity to change it to the new setting.

[iViscosity]

Changed it to add a new option rather than overwriting an old one. The reason I made it 1 before and not 3 is because I looked at them as a scale of permissibility; 0 being least permissive and 3 being the most permissive.

This is untested and I changed it right before I'm about to go to bed, but if someone could test that'd be great.

[zpetty33]

I'll merge this when someone can confirm that it works.

[thecraftianman]

This still works with no issues as-is; any chance this could finally be merged?