allow autostart of jackd on OSX where device-names can
contain spaces.

- jack_remove_properties and jack_get_properties both search the metadata database for matching UUID string.
- However, they both fail at finding any matching UUIDs ever.
- The UUID string in the database are correctly created on a previously cleared buffer (e.g. memset to 0).
- The temporaty UUID string in the search routines however are not created on a cleared buffer, the end of the buffer thus may contain anything.
- As in the matching routine the complete UUID strings are compared (with size JACK_UUID_STRING_SIZE), there will never be a matching air, even if their valid part do match.

This cannot be implemented at present because jack_port_set_name() does not take
a jack_client_t* as an argument, and thus no msg can be sent to the server
regarding the name change. Jack2 accomplishes this by walking its static array
of clients to find one that is in use and sends the msg using that one. This
is not possible in Jack1 because we do not use static arrays of clients (or
ports).

* move port UUID initialization into engine so that it is actually shared across clients
* export jack_server_dir() within libjack

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4771 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4768 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4766 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4763 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4544 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4543 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4542 0c269be4-1314-0410-8aa9-9f06e86f4224

git-svn-id: svn+ssh://jackaudio.org/trunk/jack@4537 0c269be4-1314-0410-8aa9-9f06e86f4224