Revert "implement OSX hook"

This reverts commit 1b7526cc931c68abfb7a0153d97c3ed8ed37ef97.

Reason: Removing unrarall-regex-add due to unnecessary complexity, the hook currently depends on it so need to revert back to stub code
Revert "Implemented a single regex that is compiled by the clean hooks run. Building the regex can be done by the hooks and will be added to a unique find command run afterwards to delete garabage."

This reverts commit 874cfa4a4ecfca1b15946d2619ba7f109394a7f7.

Reason: Removing unrarall-add-regex due to unnecessary complexity. Unfortunately small clean-ups were also included in this commit so they'll have to be manually re-added :(
Applied various minor fixes that were originally from another commit.
Fixed error in sed regular expression.
Provide slightly more informative message about extraction success.