Rebuild against QT 5.12.1 and updated to 5.11.3

Summary:
Rebuild against QT 5.12.1 and updated to 5.11.3

Depends on D5284

Changelog:

• Fixed QByteArrat.at() and getitem() to return a byte with Python
• Updated the OpenGL examples to explicitly set a supported OpenGL
• Fixed a regression in the handling of signals with 'const char *'
• Renamed QRandomGenerator.global() to global_().
• Fixed the qmlscene and designer plugins to use the private copy of the sip module.

Test Plan: Rebuild calibre/spyder against it

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D5286