feat(mu4e): reintroduce A and p view keybindings
feat(mu4e): reintroduce A and p view keybindings

When viewing a message, in mu4e < 1.6 'A' gives actions that can be
performed on the attachments, and 'p' / 'P' save attachments. The
functions are removed in 1.6, and their nearest replacements are not
bound. I think it makes sense to actually bind them.

hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/doom-emacs,hlissner/doom-emacs