Color Management: add ACEScg to the default configuration

For more easily reading and writing ACEScg EXR files.

release/datafiles/colormanagement/config.ocio

@@ -93,7 +93,7 @@ colorspaces:
     equalitygroup:
     bitdepth: 32f
     description: |
-      ACES linear space
+      ACES2065-1 linear space
     isdata: false
     allocation: lg2
     allocationvars: [-8.5, 5]
@@ -102,6 +102,21 @@ colorspaces:
         - !<FileTransform> {src: srgb_to_xyz.spimtx, interpolation: linear}
         - !<BuiltinTransform> {style: "UTILITY - ACES-AP0_to_CIE-XYZ-D65_BFD", direction: inverse}
 
+  - !<ColorSpace>
+    name: Linear ACEScg
+    family: linear
+    equalitygroup:
+    bitdepth: 32f
+    description: |
+      ACEScg linear space
+    isdata: false
+    allocation: lg2
+    allocationvars: [-8.5, 5]
+    from_reference: !<GroupTransform>
+      children:
+        - !<FileTransform> {src: srgb_to_xyz.spimtx, interpolation: linear}
+        - !<BuiltinTransform> {style: "UTILITY - ACES-AP1_to_CIE-XYZ-D65_BFD", direction: inverse}
+
   - !<ColorSpace>
     name: nuke_rec709
     family: display