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/app/email/autoload/email.el

@@ -1,15 +1,15 @@
-;;; app/email/autoload/email.el
+;;; app/email/autoload/email.el -*- lexical-binding: t; -*-
 
 ;;;###autoload
 (defun =email ()
   "Start email client."
   (interactive)
-  (call-interactively 'mu4e))
+  (call-interactively #'mu4e))
 
 ;;;###autoload
 (defun +email/compose ()
   "Compose a new email."
   (interactive)
   ;; TODO Interactively select email account
-  (call-interactively 'mu4e-compose-new))
+  (call-interactively #'mu4e-compose-new))