Summary
A convenience struct to easily manage a time countdown, based on 
RealTime.GlobalNow.
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Typical usage would see you assigning to a variable of this type a necessary amount of seconds.
Then the struct would return the time countdown, or can be used as a bool i.e.:
RealTimeUntil nextAttack = 10;
if ( nextAttack ) { /*Do something*/ }
Properties
| Absolute | Time to which we are counting down to, based on Sandbox.RealTime.GlobalNow. | 
| Fraction | The countdown, but as a fraction, i.e. a value from 0 (start of countdown) to 1 (end of countdown) | 
| Passed | Amount of seconds passed since the countdown started. | 
| Relative | The actual countdown, in seconds. |