defercall: use timers instead of QMetaObject::invokeMethod #48132
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This reworks
DeferCallto trigger calls using timers of zero rather than relying on a special mechanism provided by the event loop. Notably, this makesDeferCallwork with the new event loop, since timers work with the new event loop.A side effect is the timer subsystem must be initialized before queuing any deferred calls, and all deferred calls must be resolved/cleared before the timer subsystem is deinitialized.