Update centos-art.sh `svg' functionlaity:
    
        - Introduce REGEX variable to find's regular expression filter.
    
        - When no file match find's regular expression, output a message
          and end script execution.
    
        - By default, find's regular expression matches regular files
          ending on `.svg'. If a regular expression is passed as in
          `--filter=regex', find's regular expression appeds regex to
          `.svg$' file termination in order to reduce the list of files to
          process as set in the final regex expression. For example, if
          regex is `.*/summary' the final find's regular expression would
          be `^.*/summary\.svg$'
    
        - Use one-dimensional variable arrays to handle metadata
          information inside svg_updateMetadata.sh function script.