v0.0.10 Peak level meter!

Because of an update from the WaveLinkClient plugin, we can now get the peak levels.
Things to know:

1. It only works on inputs for now, I'll add outputs a.s.a.p.
2. It can read left and right channels, but I've defaulted to the left channel for now. MIDI mixer only supports one channel for the meter.
3. I multiply the level with the volume to get the 'relative' peak level for a mixer. I don't know if that should be an option or not, let me know.
4. Can be a little glitchy because there's a 150ms update speed. Sometimes wavelink is a little slower than that I think. I'll work on it.