core/packs/lang-{clojure,common,lisp}: Better lambda/fn hacks

Make the lambda->λ, fn->ƒ font-lock hacks actually work.

In clojure-mode, (fn) gets replaced by the lambda symbol, #() with ƒ,
and #{} with ∈.

In emacs-lisp-mode and lisp-interaction-mode, substitutions are made
for (defun) and (lambda).

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
core/packs/pack-git: Commit log customisation

Set auto-fill and flyspell-mode in magit-log-edit-mode.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>