Update test suite
Improve and fix Attributes builder
Add initial image metadata implementation #1453
Change image dimension reading in XHTML #1453

Remove Java extension for ImgUtils and use ImageMetadataModule instead.
Remove resource-only files from image metadata processing #1453
Remove deprecated argument properties #1455

* args.odt.include.rellinks
* args.fo.include.rellinks
* disableRelatedLinks
Fix ODT link processing bug #1455
Add path2project-uri PI #1320
Refactor and document subject scheme related code
Separate subject scheme reader from filter utile

Subject scheme reader can also be used by validation.
Merge branch 'develop' into next/develop