Show Doxygen some Love!

[Vastrix]

Hey,

Pretty self explanatory really..
Doxygen support for the tooltip isn't really amazing, I mean, it's there but.. yea :s

Here you can see that \warning and \image both lack proper rendering, also \c could use a different font and background perhaps?
These are just the ones I tried, pretty sure there are more?

Regardless, great extension! :)