Revert use of the BlueSocket framework to be able to codesign the application

With NXDRIVE-1307, we built the extension on a personal machine and included the resulting package directly into the FinderSync sources to ease compilation steps.
But both extensions are not compiled against the same Swift version and so the FinderSync build always fails.

The goal is to build both extensions on the same machine, preferably dynamically into the same Jenkins job. We could enhance the current one: Drive-extensions.