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/javascript/+screeps.el

@@ -1,4 +1,4 @@
-;;; lang/javascript/+screeps.el
+;;; lang/javascript/+screeps.el -*- lexical-binding: t; -*-
 
 ;; TODO Constants may be out-of-date
 
@@ -171,8 +171,9 @@
   :match "/screeps/.+$"
   :modes (+javascript-npm-mode))
 
-(add-hook! '+javascript-screeps-mode-hook
+(defun +javascript|init-screeps-mode ()
   (when (eq major-mode 'js2-mode)
-    (push 'javascript-jshint flycheck-disabled-checkers)
+    (cl-pushnew 'javascript-jshint flycheck-disabled-checkers)
     (setq js2-additional-externs (append '("_") screeps-objects screeps-constants))))
+(add-hook '+javascript-screeps-mode-hook #'+javascript|init-screeps-mode)