Make a postprocess to handle capitalisation about apertium HOT 8 CLOSED

@ftyers we can use secondary tags to propagate the case till the post generator and then apply it there if needed.

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At what stage exactly and on the basis of which information? I'm thinking about how dealing with the difference in French nouns like "allemand" (the language) and "Allemand" (a person). Currently, I do this in transfer.

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This is related: #75

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@hectoralos I would do it in posttransfer using the LU and perhaps a 1-2 word context window.

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@ftyers basically only using dictionary case and "is this a sentence end"-context and ignoring input case? We'd lose the ability to keep UPPER CASE and Titles with Titlecase but maybe that's worth the code simplification …

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lt-proc could record the original capitalization and put that in word-bound blanks which could then be used to determine that.

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@mr-martian lt-proc outputs the original word form anyway, so a separate step can do the job. I actually have a branch of nno-nob that just adds tags aa/Aa/AA that way to all words (capstag.rlx runs after morph ana/dis), removed again in transfer. I'm considering switching to this system so we can get dictionary-based correction but keep input caps (for start of sentence or where there are several upper-cased words in a row), but have to make sure it doesn't lead to regressions first.

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Processor added in 7e7004d

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