core/renderloop: Use QBasicTimer where precision matters

Aleix Pol Gonzalezrequested to merge
work/apol/basic-timers into master

During CPU profiling QTimer would consistently show, so ported to a lighter version. Assuming that the vrr timer might benefit from a similar treatment.

Signed-off-by: Falko Becker falko.becker@mbition.io

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