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Add peak indicators to the mixer strips. They show the maximum peak value that was observed and can be reset by clicking on them. ## Implementation details The implementation works via a signal/slot mechanism. The `Fader` class has a new signal `peakChanged` which reports peak values as amplifications. A new class `PeakIndicator` is added which has a slot `updatePeak` which is connected to the new signal in `Fader`. The `PeakIndicator` inherits from `QLabel` and mainly deals with updating the label text from the current peak value. Add a `PeakIndicator` instance to `MixerChannelView`. Add a `reset` method to `MixerChannelView` so that the mixer channel can be reset on the loading of new projects, etc. The current implementation resets the peak indicator back to -inf dbFS. The `reset` method is called in `MixerView::clear`. Remove the clamping in `Fader::setPeak` so that all peaks are reported. Emit the new signal if the peak changes.