various upgrades and fixes to xliff2 and xliff 1.2 support

updates to ISegmenter to preserve code ids when joining in TextUnitMerger

various fixes to merger code (TextUnitMerger) additional support for custom mrk elements in xliff2 and xliff 1.2

clean up xliff2 test files to pass integration tests

disable xliff2 “deepenSegmentation“ for now.

update tests with new xliff2 files

remove unneeded checks and logged warnings

fix xliff2 filter handling of ignorable - auto-create target (copy of source) if needed

xliff2 segment and ingorable now have auto-generated id’s

Small fix to GenericSkeleton to allow deep copy of all parent references (not just “self”)

fix xliff 1.2 filter to support custom mrk elements (id conflicts with mtype=seg)

update xliff 1.2 filter to output id’s for all elements (mid etc..) if possible

now align and copy original target codes in case there are added codes in the target. Also to preserve existing target attributes and properties.

Update Tikal to preserve whitespace in the extracted xliff 1.2

clean and simplify TextUnitMerger logic.

Fix several unit tests to provide more accurate output on failure. Update tests expecting wrong results.