FEAT: Add additional PHP ext checks

[seanvree]

• Add requred extension:

extension=openssl

• Add write permissions check:

assets/php/phpinfo.php

    ini_set('error_reporting', E_ERROR);

    echo "<center>";

    echo " <strong> Required Extensions: </strong> ";

    $myfile = fopen('php-perms-check.txt', 'w');

    if (!$myfile) {
        echo " <a class='extfail' href='https://github.com/Monitorr/Monitorr/wiki/01-Config:--Initial-configuration' target='_blank' title='Write permissions FAIL'>";
            echo "Perms";
        echo "</a>";
    } else {
        echo " <div class='extok' title='Write permissions OK' >";
            echo "Perms";
        echo "</div>";
        fwrite($myfile, "PHP write permissions OK");
        fclose($myfile);
    }