Major optimization refactor, across the board

+ enable lexical-scope everywhere (lexical-binding = t): ~5-10% faster
  startup; ~5-20% general boost
+ reduce consing, function calls & garbage collection by preferring
  cl-loop & dolist over lambda closures (for mapc[ar], add-hook, and
  various cl-lib filter/map/reduce functions) -- where possible
+ prefer functions with dedicated opcodes, like assq (see byte-defop's
  in bytecomp.el for more)
+ prefer pcase & cond (faster) over cl-case
+ general refactor for code readability
+ ensure naming & style conventions are adhered to
+ appease byte-compiler by marking unused variables with underscore
+ defer minor mode activation to after-init, emacs-startup or
  window-setup hooks; a customization opportunity for users + ensures
  custom functionality won't interfere with startup.

modules/lang/web/+css.el

@@ -1,4 +1,4 @@
-;;; lang/web/+css.el
+;;; lang/web/+css.el -*- lexical-binding: t; -*-
 
 ;; css-mode hooks apply to scss and less-css modes
 (add-hook 'css-mode-hook #'rainbow-delimiters-mode)
@@ -53,5 +53,5 @@
 
 (def-package! stylus-mode
   :mode "\\.styl$"
-  :init (add-hook! stylus-mode '(yas-minor-mode-on flycheck-mode)))
+  :init (add-hook! stylus-mode #'(yas-minor-mode-on flycheck-mode)))