audact 0.4.0

Simple synth and sequencing lib
Documentation
# audact
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Simple synth and sequencing lib

Contains:
- Simple sine, square, saw and noise waveforms.
- Hard-edge cut-off filters.
- Basic sequencing of a single pattern.

Usage:

```rust
extern crate audact;

use audact::system::{ Audact, Wave };
use audact::notes::std_note_freq;

fn main() {
    let mut audact = Audact::new(16, 120, 4f32);

    audact.channel(std_note_freq(0), Wave::Sine, 1f32, (0f32, 1f32), vec![0,4,8,12]);
    audact.channel(std_note_freq(2), Wave::Square, 1f32, (0f32, 1f32), vec![2,6,10,14]);

    Audact::start(audact, 1);
}
```