Color Ramp - Sort Stops

Four new options under the "tools" dropdown in the Color Ramp node, all of which would reorder the stops based on their HSV value.

• Sort By Hue
• Sort By Saturation
• Sort By Value
• Sort By Alpha

There are two approaches the positioning of the stops could be handled:

• The positions are kept from before sorting, and the stops are simply swapped. If two or more have the same value, the one further to the left takes priority.
• The stops are repositioned based on their values. If two or more stops have the same value, they are either averaged or the first one takes priority and the rest are discarded.