Improve code snapshot generation for PDF docs (#1353)

CMake: execute `code_snapshot` separately for each file we want to
  scan so we can create timestamps and generate PNG images only if
  the source file (e.g. unicode.dox) was modified.

documentation/src/unicode.dox: remove output folder `generated`, use
  only the filename. CMake sets the current working directory as needed.

util/code_snapshot.cxx: format and improve comments, reset code buffer
  so we can generate multiple images per input file.

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