Add "rendered" mode for extract to ImageJ

[bogovicj]

What is the current behavior for sources whose affine (pixel-to-world) transformations are not axis aligned?

Add new options

• virtual
  • if not virtual, use number of threads in Fiji prefs to render into a newly allocated ImagePlus
• interpolation : use current setting for bigwarp
• rendering resolution: use the currently selected scale level
• viewer coordinate
  • if true, the x and y axes should be the viewer's current x/y (rather than world x/y)
  • would need a new not-world-axis aligned bounding box overlay