Allow changeable colors for PointSet objects

[leandervaneekelen]

PointSet objects in ASAP are great because they seem to have much higher graphical performance than their counterpart (Points). This allows you to present point annotation in large ROIs (perhaps even entire WSIs) in the form of a PointSet with a minimal decrease in viewing experience in terms of speed, whereas a similar situation with Points would slow down rapidly.

However, you cannot change the color of PointSet objects; they merely change from dark blue to light blue when they are selected. It would be cool if they behaved the same was as Points, with alterable colors.