Create a .Delay() API

This can be a `delay` library separate from SB.
It should allow support for both widget and gadget delay mechanisms:
- Delay(Update) - time based
- Delay$Callin, such as DelayGameFrame, DelayUnitKilled, and so on

`WG.Delay.Delay(callin[, time])`
`WG.Delay.DelayGameFrame(callin[, gameFrames])`
`GG.Delay.DelayUnitKilled(callin[, callinInvocations])`