Several smaller fixes to provide an improved handling of installing/using RT on macOS.
* mac: update entitlements for 10.15.4
* mac: fix the CLI. Provides an un-codesigned rawtherapee-cli outside the app bundle for use on the terminal command line, using the app bundle's 3rd-party libraries.
* How to install RawTherapee.app and rawtherapee-cli for macOS
