Copy rendering 11552

This is the second phase of the Web copy/paste rendering settings work.
Should now be comparable to that in Insight.

 - Copy & paste settings in main image-viewer
    - copy current settings, not saved settings
    - pasting settings should update corresponding thumbnail in main webclient
 - Copy & paste settings in right-hand Preview tab
    - copies the saved settings
    - paste should update thumbnail too
 - These should work well with the existing functionality:
   - copy and paste from Dataset / Image / Plate / Run in tree right-click menu.

To test, please try as many combination of copy & paste targets as possible:
    - Copy from Image Right-Click menu, Preview Panel or Image Viewer (unsaved changes)
    - Paste to Image/Dataset/Plate/Run right-click menu, Preview Panel or Image Viewer.