doxygen: Fixed all warnings
This commit removes trailing spaces and converts tabs to spaces in all files affected by fix-doxygen PR.
This commit fixes nearly all of the reported doxygen warnings. I tried to not clutter the log with removed trailing spaces. Removed whitespace and converted tab/spaces for all files affected by this commit are in a separate branch.
Simon Duquennoy
Tommy Sparber
Enrico Joerns
Jim Paris