Fix Doxygen Generation

[eXpl0it3r]

Similar to SFML/SFML#2986 this fixes a bunch of things:

• Handles generation issues with Doxygen 1.10.0
• Brings the Doxygen file up-to-date
• Fix missing function documentation, fixes Generated CSFML documentation does not document any functions #210
• Enables the search similar to Update doxygen configuration and enable searchbar SFML#2173 & Update Search in the Doxygen Documentation SFML#2477
• Fixes some URLs
• Fixes XHTML issues reported in Generated documentation contains some HTML errors SFML#2812
• Fixes errors for the cookie.js (copied from Fix Doxygen Generation SFML#2986)
• Makes the new clipboard feature work properly (copied from Fix Doxygen Generation SFML#2986)

For the missing function documentation, I'm not entirely sure if the EXTRACT_ALL is really enough.
Yes, you can now find the functions, e.g. by going to a file or search for it, but there's no nice overview, and unfortunately, doxygen doesn't seem to have a "function" tab and in a C source the "class" tab is only partially useful.
I wonder, if it would still make sense to create modules to collect all the functions of the same SFML class in one overview page.

For now however, I believe this should be good enough.

[kimci86]

but there's no nice overview, and unfortunately, doxygen doesn't seem to have a "function" tab

It is maybe a little hidden but there is a list in Files > File Members > Functions

[kimci86]

Little suggestions: bugfix/doxygen-docs...kimci86:CSFML:bugfix/doxygen-docs