Support table/figure link styles for PDF #1267
Change dita command syntax #1506
Fix conref domain validation

Refactor conref XSLT for better XSLT 2.0 feature usage.
Refactor conref XSLT stylesheet
Fix documentations syntax bug
Refactor conref XSLT for better variable names
Improve documentation
Merge remote-tracking branch 'robander/feature/1267' into develop
Update documentation
Refactor copy-to processing

When using a StreamResult(File) in filter processing on Windows, the
output file was left with an open stream. Using a manually closable
output stream fixes this issue.
Refactor code to use URI instead of String or File #1544
Remove deprecated code
Fix dita command

The -f option was mishandled as an Ant option.
Fix dita command bug

Shell and batch scripts were using old Ant syntax for -f option.
Update documentation
Add validation for attribute generalization #1619
Clean filtering utils and improve unit tests
Refactor filtering code
Improve keydef reader

Ignore duplicate keydefs in a map. Add unit test for nested keydefs.
Refactor keydef reader to use DOM instead of SAX for parsing