Allow zooming in project view

[twynb]

As of current, the project view's waveform display will always show the whole audio file. This can be hard to work with especially with long audio files.

Ideally, it should be possible to zoom in and see smaller segments of the audio file.

[phtngyn]

Is the zoom feature still needed if we now have a better segment detail view?

[twynb]

Maybe, depends on how or where #59 is implemented. If that happens on the main project view (which imo would probably be the most intuitive), zoom would absolutely still be needed