Include scale bar and timestamp in screenshots

[frasercl]

Use Case

Currently, when I press the "screenshot" button in the top-right corner, the scale bar and/or timestamp are not included in the screenshot.

Solution

The scale bar and timestamp should be included in the screenshot. Perhaps they get rendered to an OffscreenCanvas and then pasted over the rendered image?

[frasercl]

Note: #235

[frasercl]

This and #310 imply a broader overhaul to these in-view elements could be welcome

[jennifermccarty]

Dan - keep in parking lot