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[#1172] Fix animation flipping behavior  (#1174)

Closes #1172

## Changes:

- Updates Animation to remove the conditional around passing `flipHorizontal/Vertical` to its current Sprite instance, as these should _always_ be passed to ensure their "flipped" state is accurate.
- Added tests to ensure that the flag can be flipped in _both_ directions now, as previously it could only be set to `true`

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