Feature/task 704 mono behaviour ev curve again (#33)

* Removed EvCurveVolume From the scene [skip ci]

* restarted to work ToonEvAdjustmentCurve as a MonoBehaviour. [skip ci]

* Added MenuItem to create GameObject to control Toon EV Adjustment Curve.

* Fixed: UI layout order was oppositte.

* Updated reference image in the valukan test project, 005_LightAndShadows(HDRP).png, which failed in the tests.

* Updated CHANGELOG.md.

Co-authored-by: higeometry <[email protected]>

Author: H3idi-X

HDRP-DefaultVolumeProject-2020.3/Assets/SampleSceneAssets/Settings/Volumes/VolumeGlobal.asset

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