LT-10590: Include all metadata fields in flextext export

[jtmaxwell3]

I extended FlextextInterlinear.xsd to allow items to have guid attributes that can point to structured data in the element. I then changed BirdInterlinearImport.cs and InterlinearExport.cs to import and export all of the metadata, including the notebook record and genres. The notebook record is stored in , but only the fields that are visible in the info field. Genres and other possibilities are stored with a guid and a name, but the possibilities themselves are not stored in . InterlinearObjects contains the mapping between ICmObjects and xml. It is shared between BirdInterlinearImport.cs and InterlinearExport.cs.

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This change is 

[jasonleenaylor]

Src/LexText/Interlinear/LinguaLinksImport.cs line 294 at r2 (raw file):

			BIRDDocument doc;
			int initialProgress = progress.Position;
			bool canStartUow = ((IActionHandlerExtensions)m_cache.ActionHandlerAccessor).CanStartUow;

Why was this necessary now?

[jtmaxwell3]

I needed it in order to do an end-to-end unit test (TestMetaDataRoundtrip). The test framework already had a unit of work.

[jasonleenaylor]

Src/LexText/Interlinear/LinguaLinksImport.cs line 295 at r2 (raw file):

			int initialProgress = progress.Position;
			bool canStartUow = ((IActionHandlerExtensions)m_cache.ActionHandlerAccessor).CanStartUow;
			try

Ok, this code is very old and pre-dates the nice way of doing this. Instead of the try\finally We want to wrap all this code in a UndoableUnitOfWorkHelper.DoUsingNewOrCurrentUOW() That will eliminate the need for your variable and make this consistent with the current state of the art.

[jasonleenaylor]

@jasonleenaylor reviewed 6 of 11 files at r1, 2 of 2 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: 9 of 11 files reviewed, all discussions resolved