Support for Doxygen Style Comments

[astroDimitrios]

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The Met Office uses Doxygen to create API docs for our weather and climate models.

It would be good if we can use Ford since Doxygen/Fortran support is lacking and poorly maintained. If Ford could recognise Doxygen comments and somehow convert them to Ford style? Maybe it would be a good idea if the code is also displayed in the docs to be able to keep the Doxygen version in the source.

[andrewcoughtrie]

If possible a converter might be more helpful in the long run. This would also provide an easy way for people to convert from Doxygen to Ford, I personally prefer the ability to have the argument comments with the arguments themselves.