NXP-13077: Unify default buffer size for file upload / download / digest computation
NXP-13077: Get local client from controller instead of pair state (as for the remote client)
NXP-13077: Check if sync thread was suspended in all long-running processing like upload / download / digest computation / recursive calls + ensure systray icon consistency with paused state
NXP-13077: Cosmit
NXP-13077: Remove unused import
NXP-14039: Handle inconsistent pair state: <local_state='deleted', remote_state='unknown'>