Fix zip.workerScriptsPath backward compatibility issue and deprecate zip...

Fix zip.workerScriptsPath backward compatibility issue and deprecate zip workerScriptsPath.
What I really want to say by "should not be touched" is "setting both zip.workerScriptsPath and zip.workerScripts by users is not supported and the behavior is undefined". 

Maybe we want a defined behavior of "if zip.workerScriptsPath is set, zip.workerScripts has no effect". To do this we need to add a `_defaultWorkerScripts = {inflater: [...], deflater: [...]}`, which is used if and only if zip.workerScriptsPath is set.