1.4.0 - New pitch shift filter

What's changed

• Converted Zita reverb filter to a fully managed implementation.

  • This is fully analagous to the unmanaged sp_zitarev implementation, but is much easier to manage.

• Sealed Zita reverb until the API is more hardened since things are still in flux right now.

• Add new time-domain-based pitch shift filter

  • This is fully analagous to the unmanaged sp_pshift implementation, but again, is much easier to manage.

• Updated example program to be more robust and include outputs for the currently-implemented filters.

Full Changelog: 1.3.3...1.4.0