Remove PyQt5._qt from hidden imports

This was copied from the PyQt4 hook but the module does not exist.
Fix: add return value to dlls_in_subdirs, fix variable name clash
Fix spelling
Enh add function to find and deploy the qml libraries
Merge branch 'develop' of https://github.com/pyinstaller/pyinstaller into develop
Add import hook to set the qml library import path
Fix: convert QT_INSTALL_QML path to Windows format
Merge pull request #73 from glennra/develop

Fixes for PyQt5 Qml support.