Java v2.1.10736

- Add YFiles.get_content_crc method
- Reduce network traffic during enumeration
- Prevent setting passwords with unsupported characters (@ and /)
- Fix unplug of device that was not correctly detected the app only execute set_XXX functions
- Fix some incorrect timeouts when hubs are offline
- Fix parsing of URL with user but no password
- Fix timeout on YAPI.PreregisterHub method
- Fix Prog-FirmwareUpdate example to properly handle VirtualHub-4web and VirtualHub-V2
- Fix behavior of YSerialPort.readByte when there is no data available
