RCloud 2.4.0 Release

This tar ball (rcloud-full-2.4.0.tar.xz) includes RCloud 2.4.0 including all required R package dependencies frozen at their respective versions at the time of the release (tested with R 4.4.2 and R 4.2.2). Therefore it is intended to be used with a clean R installation (tested on Debian 12 system with r-base-dev), or as a container.
See README-release.md for examples of available services.

This release is based on a new Zig-based build system - see README for details.