Bring OCR to DMX
In the scope of #529 (closed) we need OCR capability to make pure image PDFs searchable.
This could be realized by utilization of Tesseract, a very mature open source software written in C++, available for all platforms. Its API can be accessed from Java by utilization of Tess4J.
Tesseract could be bring to DMX as a plugin: dmx-tesseract. It's functionality would rely on a local native Tesseract installation.
Needed for dmx-projects/lqdn#2
@jpn FYI