Fix for large NDPI and SVS files

• Integrate fixes for NDPI from https://github.com/ntrahearn/openslide
• Update Aperio fix to check for valid jpeg markers, otherwise try to render missing tile
• Integrate changes from openslide/openslide

Updated fix for large files

Updated release with fix for large files.

Fix bugs for large NDPI and SVS files

• Fix reading .ndpi files over 4GB
• Fix reading .svs files with corrupted tiles