Fix LT-22121: Analyze guesser should not guess ras for rAs

[jtmaxwell3]

This fixes https://jira.sil.org/browse/LT-22121. In order to handle cases where the occurrence was rAs but the wordform was ras, I changed the code to look up the wordform, the occurrence form, and the occurrence form with the first letter lowercased. These are usually all the same, but in rare cases they can all be different if the user chooses a wordform that isn't the occurrence form or an initial lowercase form of the occurrence form. This needed a lot of changes to the code. This should probably be saved for release/9.3.

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This change is 

[github-actions]

LCM Tests

    16 files  ± 0      16 suites  ±0   2m 54s ⏱️ -15s
 2 834 tests + 3   2 814 ✅ + 3   20 💤 ±0  0 ❌ ±0 
11 284 runs  +12  11 116 ✅ +12  168 💤 ±0  0 ❌ ±0 

Results for commit d0ec124. ± Comparison against base commit 7fd440c.

♻️ This comment has been updated with latest results.

[jasonleenaylor]

tests/SIL.LCModel.Tests/DomainServices/AnalysisGuessServicesTests.cs line 962 at r1 (raw file):

				// Don't guess lowercase even if it exists.
				IWfiAnalysis ras = WordAnalysisOrGlossServices.CreateNewAnalysisWAG(setup.Words_para0[21]);

For clarity I think you should move this below the first assert.

[jasonleenaylor]

src/SIL.LCModel/DomainServices/AnalysisGuessServices.cs line 407 at r1 (raw file):

		}

		private bool HasContextCounts(IWfiWordform wordform)

I wouldn't expect a method named HasContextCounts to have significant side-affects, it seems like some clean-up to this section would be good.

[jasonleenaylor]

Reviewed 2 of 2 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @jtmaxwell3)