Use compiled webodf.js in nativeQtClient
Fix outdated use of xmldom.XPath, now a namespace, no longer class
data is now a Uint8Array, so use subarray(), not slice(), on it
Exclude nativeQtClient from default target
Merge pull request #414 from kossebau/initialCareForNativeQtApp

Initial care for native qt app (and remove from default build)