Patch: TODO highlighting in comments

[Dmitry Risenberg]

Looks like the previous message was overlooked, so re-posting it.

Here are the patches that provide searching for TODOs in comments,
highlighting them as semantic problems and reporting via the
problemview plugin.

There is a known issue with adjacent comments, like

/* TODO */ /* FIXME */
int i;

- it will underline "TODO */ /* FIXME" part, which is wrong. This is
because /* TODO */ /* FIXME */ is seen as one token by the parser -
not sure whether it should be this way.

Also haven't measured the influence this change has on performance
(don't know if there is a simple way).

Dmitry Risenberg
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