update rainbow to use lib-merge (Rainbow tkit merger collapses segments for xliff2 input...)

[Jim Hargrave]

We found the issue with segments being collapsed on merge with xliff2.
It appears the Rainbow merger doesn't handle the segmentation properly.
But the standard lib-merge code does. I remember another bug related to the Rainbow merge code.
I guess the code has diverged enough where we are starting to see problems.
At some point we will need to update the Rainbow code to use the standard merger

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[Jim Hargrave (OLD)]

@YvesS

@Dale Eggett

@Mihai Nita

his is the ticket we discussed in the recent meeting. We need to replace the rainbow merge code with lib-merge to fix various bugs and have everything consistent.

[Jim Hargrave (OLD)]

resolved as part of the recent xliff2 filter refactor