handled cases:
Text which is transparent or is set to not render
Elements outside of clipping path
Elements that have been painted over by visible and filled Paths
unhandled cases:
Elements covered by widely stroked path
Elements same color as background
Any Text set to clipping with its many interactions with other elements
Merge in RED/ocr-service from RED-5911 to master
* commit '7a4c5c2f898e83623a66ef29ab9ed696e2057e24':
RED-5911: Reverted to old ocr logic that uses ContentReplacer/TextExtractor to remove text behind images
Merge in RED/ocr-service from RSS-146 to master
* commit '37548ddbf89c0ca5e25d18b19af9400ef5e608c0':
RSS-146: Install Ghostscript to imporve ocr quality