TODOs
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 * Type of a @var
 * warn about missing return types etc.
 * generated tokens could have annotation, generated text should have its own type
 * HTML Tags in @deprecated
 * proper HTML entity escaping
 * Formatting for @link TextConcept#StringSetLimits @endlink is broken.
 * +/- 1 bug in dox for printing errors when processing tags.

 * dot inheritance diagrams
 * Class/Concept/etc. overview pages
 * frameset structure generation
 * Do we need modules?
