pfefferle/wordpress-webmention: display webmentions in admin log widget

[dougbeal]

Right now its extremely difficult to debug outgoing webmentions, and incomming webmentions are hard. A admin widget that displayed a log of webmentions would simplify debugging greatly. It should capture incomming and outgoing webmentions (and looking to the future salmentions, vouches).

(Originally published at: https://crw.moe/b/bb)

[tw2113]

Related https://github.com/pfefferle/wordpress-webmention/issues/147