AUv3 instrument compatibility added!

- The AUv3 plugin runs at the host's sample rate (typically 44.1 or 48kHz) while keeping t advancing at a fixed 8kHz internally.
- The standalone runs the engine at its selected sample rate (8kHz by default) and lets iOS upsample to the device's hardware rate.
- Both are mathematically valid renderings of the same signal: a deterministic integer sequence produced at 8kHz. The standalone is that sequence after additional iOS filtering; the AUv3 is that sequence reconstructed with minimal coloration. The AUv3 will sound slightly brighter and crisper as a result.