Copy paste rdefs 10673

This adds some Copy / Paste rendering settings functionality to web. 

NB: you may have to refresh your browser to make sure you're not using old cached javascript.

To test:
 - In the tree, select an Image (in a Dataset or Orphaned), right-click > Rendering Settings > Copy. 
 - Select one or more Images in the tree, right-click > Rendering Settings > Paste. Any "compatible" thumbnails should be updated. This can be validated in Insight IF you think that some images are not being updated as they should.
 - Selecting a Dataset, Plate or 'Run' / Plate-Acquisition should allow you to Paste rendering settings to all the contained images (NB: not currently any way to copy settings from an image in a Plate).
 - Open Image in main viewer, adjust rendering settings and save: The thumbnail in the webclient main window should be updated (and the Preview viewer if the Preview tab is open).