Use slug instead of preg_replace #941
                
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Summary of the change:
Currently, when I set
alphanumeric_filenameand upload file with accents like Test - Žluťoučký kůň.pdf I got file namedTest-__lu__ou________k____.pdf. In my PR I propose to useStr::slug()instead ofpreg_replace().I also extended alphanumeric functionality with
convert_to_alphanumericconfig option. If this is set totrue, then when renaming or creating folder user inputs some non-alphanum characters, everything is converted to alphanum withStr::slug()instead of poping error out.