Log Message:
Update to 3.47. From the changelog:

- fixed xterm256 and truecolor whitespace output #2
  (https://gitlab.com/saalen/highlight/issues/90)
- fixed LaTeX, TeX, SVG and ODT whitespace output (regression of 3.45)
- added darkplus theme (https://gitlab.com/saalen/highlight/merge_requests/84)
- converted ChangeLog to AsciiDoc
- allowed state test indicators to match both whitespace (ws) and the
  enclosing state (others)
- CLI: default output changed to xterm256 or truecolor if run in a
  terminal with color support and only a single file is outputted
- GUI: added checkbox in the clipboard tab to output selected lines only