Added feature to start virtual machine after snapshot has been reverted.
Checking if rollback/start tasks have finished in launch function of VirtualMachineLauncher.
Added task wait function and qemu vm start function to PVE API connector.
Using `application/x-www-form-urlencoded` for login GET request.

Bug fix for the login for Proxmox v3. API documentation says to use `application/x-www-form-urlencoded` for the GET parameters. Thanks to J.D. for the fix.
Fixing inverse logic on ticket validity check

Fixing a bug where the auth ticket was always refreshed before the 2 hour mark due to an inverse time check. Thanks to JR for the fix.
Merge remote-tracking branch 'origin/develop'