emacs-lisp and common-lisp-layer had both their own
logic to work with smartparens including manually
requiring it.
This PR makes them use the standard functions. In
addition it replaces the manual require with proper
autoloading of smartparens.
Add functions equivalent to the custom eval-funtions of the elisp layer to the
common-lisp layer.
The functions are copied from the elisp layer only `eval-last-sexp' was replaced
with its slime equivalent `slime-eval-last-expression'.
Keybindings are chosen as they are in the elisp layer.
This reverts commit 29c78ce841 and all other fixes
that have been made afterwards.
The motivation is that use-package is seen by many as a replacement for
`require`. Is use-package always defer the loading of packages then is breaks
this use case, this does not respect POLA so even if it was making Spacemacs
loading faster (up to 3s faster on some startup on my machine) we just cannot
use it, it would be irresponsible. Spacemacs should be easy to use, loading
performance will come with time but it is not a priority.
