App Bundles operate in their own shell environment that is different from the one in the terminal. the default PATH variable for all Bundles is /usr/bin:/bin:/usr/sbin:/sbin. because of that mpv can not find binaries installed by package manager that might be used in scripts for example. add an option to prepend paths to the Bundle PATH. we prepend to make the order fully configurable, opposed to appending where the default Bundle binaries would always take precedence.