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.

core/core-projects.el

@@ -1,14 +1,11 @@
-;;; core-projects.el --- tools for getting around your project
-
-;; I want Emacs to be aware of the projects. `projectile' provides tools for
-;; digging through project files and exposing an API I can use to make other
-;; plugins/features project-aware.
+;;; core-projects.el -*- lexical-binding: t; -*-
 
 (defvar doom-project-hook nil
   "Hook run when a project is enabled. The name of the project's mode and its
 state are passed in.")
 
-(def-package! projectile :demand t
+(def-package! projectile
+  :demand t
   :init
   (setq projectile-cache-file (concat doom-cache-dir "projectile.cache")
         projectile-enable-caching (not noninteractive)
@@ -24,7 +21,7 @@ state are passed in.")
           "build.gradle"))
 
   :config
-  (projectile-mode +1)
+  (add-hook 'after-init-hook #'projectile-mode)
 
   (setq projectile-other-file-alist
         (append '(("less" "css")