Security Randomizer produces a Warning on Windows if openssl_* is not available
In line 166ff of the Security_Randomizer script we're currently using to create the CSRF tokens a random string is generated with following command:
$fp = @fopen('/dev/urandom', 'rb')
Despite of the Error Control Operator a warning is produced that leads to an exception in Development mode.
We should check the OS here or try the windows commands first..