Implemented WorkerThread class to be used with parallel synchronizing.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Implemented launching of WorkerThread from Syndir. It will do synchronization at the same time in parallel mode by default.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>