Modules loading on Windows

The slash between variables $basedir and $dir (see https://github.com/binarysec/owfCore/blob/master/main.php#L221) forces Windows users to have their configuration files like this :
```
core = "Users/Olivier/Desktop/OpenWF/owfCore"
```
instead of simply having :
```
core = "C:\\Users\Olivier\Desktop\OpenWF\owfCore"
```

