soup-cache: Add versioning support to SoupCache
soup-cache: Add versioning support to SoupCache

Cache index file was renamed to soup.cache2. It now contains the version of
the cache used to store data. If the version used to save the file is not
the same than the current cache versions then cache files will be deleted.

https://bugzilla.gnome.org/show_bug.cgi?id=652554

fanc999/libsoup,Distrotech/libsoup,jwendell/libsoup,fanc999/libsoup,jwendell/libsoup,Distrotech/libsoup,Distrotech/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,Distrotech/libsoup,ahmedammar/platform_external_gst_libsoup,fanc999/libsoup,ahmedammar/platform_external_gst_libsoup,jwendell/libsoup,Distrotech/libsoup,ahmedammar/platform_external_gst_libsoup,jwendell/libsoup