CB-7316 Updates file-transfer plugin with support of universal windows apps, improve current specs compatibility.

Fix for [CB-7316](https://issues.apache.org/jira/browse/CB-7316)

Adds support for Windows platform.
Improves current specs compatibility:
* Update handling credentials routine, replace parsing with Uri object by regexp parsing due to security errors in Windows.
* Add support to aborting download/upload operations for windows platform.
* Add support of progress events for download/upload operations for windows platform.
  - progress event object for upload operation is always empty, due to Windows restrictions.
* Fix multiple errors with handling invalid URLs and paths.
* Fix error callbacks in download/upload methods. Now they called with proper Error objects.