[SL1] Preview "Problem Areas" like FDM Support Overhangs color codes

[eduncan911]

Is your feature request related to a problem? Please describe.

The FDM Editor view provides warnings and shows where overhangs can be a problem, allowing one to add supports.

In SLA, I am unable to review the same preview/warnings area. This is a standard (free) feature in Chitubox.

Describe the solution you'd like

In the Editor view, I would like problem areas highlighted on the model via an alternative color, allowing me to quickly see what may need supports.

Describe how it would work

The auto-supports feature seems to find most problem areas already and add a bunch of pins settings. However, there is no color discoloration of those pin areas.

I suspect the algorithm used to place these pin heads is detecting the islands to varying degrees. Therefore, a color shading model could be linked to those varying degrees.

Describe alternatives you've considered

Using a different slicer. :(

Additional info

Here's a screenshow of Chitubox.

[eduncan911]

This is sort of related to #3929 and #3440.