#359 cpp-lexer don't higlight html comands in comentlines

[klaus]

The orginal cpp-lexer don't higlight html comands in the
commentline. only the doxygen commands are higlight.
I have now the code extended to highligth the
html-command to.
Please integrate it in the orginal code!
Thanks.

(the html keywords are in the keywords5 lists.)

[klaus]

[Neil Hodgson]

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Looks like the new styles SCE_C_COMMENTDOCKEYOTHERS,
SCE_C_COMMENTDOCKEYSTRING, and SCE_C_COMMENTDOCKEYVALUE are
not meant for display but only for keeping record for
eventual conversion to SCE_C_COMMENTDOCKEYWORD or
SCE_C_COMMENTDOCKEYWORDERROR and don't need to continue over
line ends so shouldn't be separate styles but instead local
variables.
An unterminated string value may (or may *not*, depending on
lexing range) result in a style that does not terminate at
the end of the doc comment. I don't think this is a serious
enough error to leak beyond the end of comment or end of
line. This is why the unterminated string style is limited
in scope.
The call isxdigit is unsafe on non-ASCII values so should be
protected with isascii or <0x80 or similar.
Tests are made against '\n' which will not perform correctly
on old-style Mac files which use '\r' line ends.
LexCPP.cxx was recently changed to use a new SetOfCharacters
type instead of some of the character testing functions and
this makes for a larger set of differences to reconcile when
merging the code. The new code can be found in CVS or
http://scintilla.sourceforge.net/scite.zip