SyncPlayer 1.6.4 - update from inside the app

Added

• In-app updater: the header shows the version and doubles as a manual check, an Update
  button appears when a newer release exists, and the dialog shows the release notes,
  what will be installed, download progress and a restart button. Checks run in the
  background at most once every six hours and stay silent when offline.

Fixed

• A failure in a secondary component no longer fails the whole update after the app
  itself has been installed; each component is isolated and the results are reported.
• A running executable that cannot be replaced is staged and installed on the next
  start instead of aborting the update.
• Short version tags (for example v2.0) are compared correctly, so such a release is
  offered.