This is basically a continuation of the work from #1002 but her for the
camlibs directory. The purpose was to replace spaces as a means for
indentation with tab characters.
Note: there are some files which are still offending the general
rule but are (mostly) consistent within themselves. I let them be for
the moment. Fixing them would basically replace the whole file.
Also: there are still a ton of whitespace related inconsistencies like
"x=10" vs "x = 10" or "func(10)" vs "func (10)".
This is a whitespace only change (if you include newlines as whitespace).
Most of the examples give wrong impression that `GP_UNKNOWN_EVENT` data does not need to be freed / is not heap allocated, however it's not the case - those messages are always `malloc`'d by corresponding drivers.
