change/update cuetag.sh syntax #41
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1) changed quoting on variables according to recommendations from 'shellcheck' utility
2) simplified checks for file type by adding lowercase() function
3) changed expr math to use "$(())"
4) changed check for existence of mid3v2/id3v2 to use the 'type' command instead of 'which'
type is a shell-builtin, which makes it preferable to using the not-entirely-portable 'which' command
5) corrected ID3 tag url typo
6) minor formatting (changing tabbing in 'case' commands for consistency
7) changed double-quotes ("") to single quotes where variables were not referenced
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type is a shell-builtin, so it is preferable to using the external 'which' command
Also removed the METAFLAC, VORBISCOMMENT, and TXTFILE variables by placing their contents in the VORBISTAG variable directly along with the comments explaining each of the options used
Thank you for the hard work. :)