Previously, the newlines in "///" doxygen comments were being stripped
out, resulting in incorrect translation of the comments for Python and
Java. During scanning, "///" comments are processed line by line,
whereas "/*" style get processed as a block with newlines intact.
The fix checks for the "///" style in scanner.c and manually adds a
newline at the end of each comment line. Some extra logic is also
added to properly handle empty "///" comments and ensure that a
newline gets added for those, which would otherwise be skipped.
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