Since a plugin can load a previous (< 1.3) version of SimplePie before we do,
we need to be compatible with our old method of overriding SimplePie_Cache::create().
SimplePie_Cache::create() was converted to static in 1.3 (as it was called),
requiring that we create two different definitions of WP_Feed_Cache (extends
SimplePie_Cache). Instead, we can use 1.3's new object registry, and leave
the old WP_Feed_Cache to SimplePie 1.2 versions.
see #21183.
git-svn-id: https://develop.svn.wordpress.org/trunk@21652 602fd350-edb4-49c9-b593-d223f7449a82
Uses individual files for each class. We now conditionally load only the pieces
we need, resulting in less memory usage. Also easier to maintain now that it is
not a single 387KB file.
fixes#21183.
git-svn-id: https://develop.svn.wordpress.org/trunk@21644 602fd350-edb4-49c9-b593-d223f7449a82
