[libvirt] ongoing code transitions section on the wiki

Hi all, I added a 'Ongoing code transitions' section to the BiteSizedTasks page on the wiki: https://wiki.libvirt.org/page/BiteSizedTasks#Ongoing_code_transitions BiteSizedTasks might not be the best location for it, but I wanted to start a list and that page already exists. I added 3 sections: * g_autofree/g_autoptr, with some example conversion commits * GLib in general, listing APIs that can replace custom libvirt code. Currently the list is only g_key_file for virkeyfile, g_user_*_dir for virGetUser*Dir, some virFile APIs for g_path_* APIs. * gnulib removal. I filled in a few examples of possible gnulib module replacements, and listed all the others as 'Unsorted/replacments unclear'. If you know any GLib replacements for existing code or gnulib modules, please fill them in there. Or any other incomplete code conversions internally Thanks, Cole