Fixed installer hang, minor fixes

• fixed an issue where the installer hangs due to enabling Windows features (via PowerShell) that prompt the user to restart or not while there is no UI to confirm
• fixed a regression when hiding the toolbar from web.config
• fixed an issue into FreeRDP with a special copy&paste logic into MS Office applications which disconnected the session after a special paste when pressing the enter key
• the protocol scheme when sharing a session or creating a session URL is now determined by the HTTP_X_FORWARDED_PROTO http header if available, instead of the current http request, so that https is correctly detected after a redirection by a reverse proxy or a load-balancer
• now rolling over display updates and audio block indexes if they reach max int value
• fixed a minor regression which prevented myrtille to work on old IE browsers