Created Gameplay clocks (markdown)

Gameplay-clocks.md

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+To allow for the various different components to harmoniously work together, the gameplay clock stack is quite complex.
+
+![](https://puu.sh/CVmyw/e288546e5c.png)
+
+
+`Player`:
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+- Adds offsets
+- Performs seeks
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+`PauseContainer`:
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+- Pauses and resumes
+- Caches a `GameplayClock` (disallowing children to process frames)
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+`RulesetInputManager`:
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+- Ensures consistent gameplay frames
+- Handles replay and spectator edge cases via a `ManualClock`
+- **Limits updates of all children**
+- Recaches `GameplayClock` but also **applies the clock to all children**.