[Rev 01] RFR: 8242523: Update the animation and clip envelope classes

[Nir Lisker]

> Mostly refactoring in preparation of the upcoming fixes. The changes might look like a lot, but it's mostly rearranging
> of methods. Summery of changes:
> ### Animation
> * Added `isNearZero` and `areNearEqual` methods that deal with `EPSILON` checks.
> * Added `isStopped`, `isRunning` and `isPaused` convenience methods.
> * Added `runHandler` method to deal with running the handler.
> * Moved methods to be grouped closer to where they are used rather than by visibility.
> * Removed the static import for `TickCalculation`.
> * Various small subjective readability changes.
> * Behavioral changes: switching `autoReverse` and `onFinished` properties from "Simple" to "Base" properties; and lazily
>   initializing the `cuePoints` map.
> 
> ### Clip Envelopes
> * Added `MultiLoopClipEnvelope` as an intermediate parent for infinite and finite clip envelopes.
> * Rearranged methods order to be consistent.
> * Replaced the `checkBounds` method with a new overload of `Utils.clamp`.
> * Renamed `pos` to `cyclePos`.
> * Extracted common methods: `changedDirection` and `ticksRateChange`
> * Added internal documentation.
> 
> Also corrected a typo in `TicksCalculation` and added an explanation for an animation test.

Nir Lisker has updated the pull request with a new target base due to a merge or a rebase. The pull request now
contains 10 commits:

 - Merge branch 'master' into 8242523_Update_the_Animation_and_ClipEnvelope_classes
 - Synch whitespace fix
 - Addressed review comments
 - Removing cycleNumber for now
 - Fix typo in TicksCalculation & add an explanation for an animation test
 - Initial push of 8242523
 - Comment out erroneous test
 - Fix IndefiniteCycleDuration test
 - Fixed single loop test
 - Initial commit

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Changes: https://git.openjdk.java.net/jfx/pull/196/files
 Webrev: https://webrevs.openjdk.java.net/jfx/196/webrev.01
  Stats: 660 lines in 9 files changed: 344 ins; 180 del; 136 mod
  Patch: https://git.openjdk.java.net/jfx/pull/196.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/196/head:pull/196

PR: https://git.openjdk.java.net/jfx/pull/196