ColorSwatchGroup:Allow Custom

Build 3716 on refactor/color-input-and-picker
Reviewing disabled
The baseline is taller and thinner than the new snapshot (285x26 to 1168x20).
Baseline History
Build 37164161476
Current build. There are unaccepted changes, so build 3706 is still the baseline.
Commenting is disabled because there's a newer build on this branch