Fix an unbounded blocked-thread leak in runJavaScript; ObjC over-retains + jsaddleWebViewInvalidate for wkwebview - #171

Fix an unbounded blocked-thread leak in runJavaScript; ObjC over-retains + jsaddleWebViewInvalidate for wkwebview#171

hamishmack merged 4 commits into

masterghcjs/jsaddle:masterfrom

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