[SyllableBasedPhonemizer API] Make alias extension restriction to same subbank optional #939
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This PR makes it so that aliases can now also be extended across different subbanks in syllable-based phonemizers. Note that the option to restrict it to only the same subbank has not been removed; I've simply made it so that it will be up to the phonemizer developers to decide.
The reason I am making this PR is because the current spec can cause issues when extending diphthongs in certain languages (including English) across different pitches and/or voice colors.
In order to re-implement the previous spec into a phonemizer, the code should look something like this:
or, in negative form: