Handle unknown options better

[JonTheNiceGuy]

Add unknown_option=() to the parse_param() function.

In the block -?*), replace the existing code with:

-?*)
      empty_command=0
      exists=0
      for i in "${!unknown_option[@]}"
      do
        if [ "${unknown_option[$i]}" == "${1}" ]
        then
          exists=1
        fi
      done
      [ "$exists" -eq 0 ] && unknown_option+=("${1}")
      ;;

Re-order the [[ $empty_command -eq 1 ]] && usage and $unknown_option part to use:

  for i in "${!unknown_option[@]}"
  do
    empty_command=1
    msg "[ERROR] ${RED}Unknown option provided: ${unknown_option[$i]}${NOFORMAT}"
  done
  [[ $empty_command -eq 1 ]] && usage

Note that this doesn't handle something like: some_command --unknown "with value" - you'd need to check whether the $2 contains a non-hyphen prefixed string and if it does, add it on to the unknown_option array member.