CLDINT-1238 Box icons, improved errors handling
CLDINT-860 fix of next changes link GET service
CLDINT-860 commands executor in fixed pool; distinguishing of changed and removed files for sync; improved user notification for auto-sync
CLDINT-1238 Box Webdoc type support; upgrade to PLF 4.0.3
CLDINT-860 improvement of transparent synchronization (Refresh action indicates changes and force next sync); upgrade to Box driver 2.1.x