New CLI option to enable serving only mode (issue #111)
The CLI in this release adds a new -x (--serve_only) option. This disables SSDP discovery of renderers and automatic streaming.
swyh-rs-cli starts and will do nothing but wait for streaming requests from renderers. See issue #111 and the changelog for more details.
Also, boolean options for the CLI commandline no longer need a true/false argument, it's optional and only evaluated for options that are stored in the config file..
Windows setup and binaries and Ubuntu 20.04LTS and up appimage in assets.