Doxygen: Update the version of the Doxyfile
Doxygen: Update the version of the Doxyfile

This patch bumps the Doxyfile to match more recent versions of
Doxygen. The sections that are deprecated have been removed, and the
new ones added. The project name has also been updated.

haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5