Updated beta release of CsoundVST3

This is an updated beta release of the CsoundVST3 project.

This project implements a VST3 plugin version and an AudioUnit plugin version of Csound 6.18 for the macOS operating system, as well as a standalone app version of the plugin. It is an open source, simplified version of the earlier CsoundVST plugin (which used the VST2 protocol).

The basic idea here is to get all of Csound, and an editor for the Csound code, running in digital audio workstations.

See the README.md for more information.

Please log bug reports, comments, and feature requests in the GitHub issues page.

This release adds basic search and replace to the code editor.