StreamCore is now a Music21Object; Iterator improvements #1295
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Typed Python does not work well with Mixin classes. There's little harm to making StreamCore a Music21Object, so it is now.
Other changes:
Attempt to unify
__getitem__
on Stream and StreamIterator. For v8, a bare string w/o a dot or other query mark is discouraged, since in v7 it does different things on Streams (getElementSByClass) and on StreamIterators (getElementSINGULARById). In v9, these two types of calls will be unified into the same syntax.