Add missing 'objdetect.CascadeClassifier.read' #1376
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Add missing method 'Read' for 'CascadeClassifier' in 'Objdetect'.
Tried to get wasm up and running with face detection but it blows up on me.
CvDnn.BlobFromImage for Dnn-based detection and cascadeClassifier.DetectMultiScale (probably due trying to load a physical file in the cascadeClassifier instance)).
Maybe FileNode can be provided inmemory/virtual filesystem so that we do not have to touch filesystem stuff that break wasm library?