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Give Distribute better support for handling timevarying transforms
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Move CompositeTransform, and several other categorical abstract transform types to a new file, openbr_internal.h. Adjust files in plugins to include the new file rather than incldue openbr_plugin.h directly.
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Introduce 'pseudocopy' operation which, which if called on a time-invariant transform, returns the transform, but if called on a time-varying transform returns a copy of the current state of the time-varying transform. Composite transforms apply pseudocopy to their children (if they contain any time-varying transforms). Introduce a wrapper class that uses Resource to let time-varying transforms act like time-invariant transforms, currently only used by distribute (it is assumed that any work that is being distributed is in fact independent).
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This is currently implemented by an event filter on the QApplication, which isn't great, but I couldn't get a QShortcut to work.
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Don't explicitly release the VideoCapture when it runs out of frames, further investigation is needed, but this seems to cause an overrun or something Additionally, make TemplateDataSource behave consistently with VideoDataSource, breaking only after getNext has been called when no further frames are available.
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Since it's actually a distance, being named KeyPointMatcherTransform prevented name lookup from working correctly
