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gui: Drop qt4 support
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Authored by deadalnix on Sep 27 2018, 10:51.

Details

Summary

build: Build system changes to support only Qt5

gui: Remove QT_VERSION fallbacks for Qt < 5

There were surprisingly many #ifdef fallbacks for Qt 4.

Remiving them simplifies maintenance, as well as adding new GUI
functionality.

doc: Remove mention of Qt4 from build docs

This is a backport of core's PR13458

Depends on D1802 and D1818

Test Plan
make check

Diff Detail

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