More font-lock keywords for Elisp

This library defines more font-lock keywords for Emacs Lisp.

These keyword variables are available:

• morlock-el-font-lock-keywords expressions that aren’t covered by the default keywords.
• morlock-op-font-lock-keywords expressions that would be operators in other languages: or, xor, and and not.
• morlock-cl-font-lock-keywords expressions that used to be covered by the default keywords but aren’t anymore since the cl- prefix was added.
• morlock-font-lock-keywords combines the above three.

To use morlock-font-lock-keywords in emacs-lisp-mode and lisp-interaction-mode enable global-morlock-mode.

If you want to only enable some of the keywords and/or only in emacs-lisp-mode, then require morlock and activate the keywords in one of the variables using font-lock-add-keywords. Doing so is also slightly more efficient.

(font-lock-add-keywords 'emacs-lisp-mode morlock-el-font-lock-keywords)