v4.0.10509.0-Beta

• WebDAV Drive sample now receives "created", "updated", "deleted", "moved", "locked", "unlocked" change notifications from the server via Web sockets.
• IEngine.FilterAsync() method now has an OperationType parameter. The FilterAsync() implementation is refactored in Virtual Drive and WebDAV Drive samples.
• IOperationContext optional parameter added to the IEngine.FilterAsync(), ILock.LockAsync(), ILock.UnlockAsync() and ILock.GetLockModeAsync() methods.
• AutoCAD temp files filter prototype added to Virtual Drive and WebDAV Drive sample. Filtering code moved to Windows Common project.
• MS Office / AutoCAD sample docs monitor did not dispose of. Now the monitor is properly disposed of.
  
• Locking refactored in WebDAV Drive sample.
• Detetion code in VirtualDrive sample moved from DeleteCompletionAsync() to DeleteAsync().
• Icons in Lock/Unlock context menu provided in Virtual Drive sample.
• Deleting ETag or custom columns for folder caused the deletion of all columns, ETags and locks data for underlying folders. Now the ETag or custom columns are properly deleted for the specified folder only.
• Virtual Drive and Virtual File System samples hydrate the file when a file is added to the remote storage. Now, this bug is fixed.