[PyQt] Heads Up: Re-packaging QtWebEngine

[Phil Thompson]

Starting with v5.12 the QtWebEngine, QtWebEngineCore and QtWebEngineWidgets modules will be packaged as PyQtWebEngine and be separate from the main package.

This only affects installing from source and wheels - it does not affect your source code.

Doing so will halve the size of the PyQt5 wheel.

Phil