Saturation & Brightness/Value Gain using Oklab color space (#1477)

* Imported Oklab reference implementation

* Add Okhsv conversions

* Fixed formatting error

* Add saturation and value gain to schemas

* Add english translation for saturation, value gain

* Created OkhsvTransform

* Make OkhsvTransform configurable

* Apply OkhvsTransform

* Clamped values during transform

* Precalculate isIdentity in OkhsvTransform

* Skip OkhsvTransform if it is the identity function

* Added changelog message

* Allow for full desaturation

* Imported recommended changes by LordGrey

* Fixed typo in constant

* Fixed anti-pattern in ok_color.h

* Correct indentions

* Correct remote-control

* Limited maximum gain settings to practical range

* Renane valueGain to brightnessGain for clarity and understanding

Co-authored-by: LordGrey <lordgrey.emmel@gmail.com>

libsrc/api/JSONRPC_schema/schema-adjustment.json

@@ -134,6 +134,18 @@
 					"required" : false,
 					"minimum" : 0,
 					"maximum" : 100
+				},
+				"saturationGain" : {
+					"type" : "number",
+					"required" : false,
+					"minimum" : 0.0,
+					"maximum": 10.0
+				},
+				"brightnessGain" : {
+					"type" : "number",
+					"required" : false,
+					"minimum" : 0.1,
+					"maximum": 10.0
 				}
 			},
 			"additionalProperties": false