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/feature/file-templates/config.el

@@ -1,4 +1,4 @@
-;;; feature/file-templates/config.el
+;;; feature/file-templates/config.el -*- lexical-binding: t; -*-
 
 (require! :feature snippets)
 
@@ -31,12 +31,13 @@
                       (overlay-get yas--active-field-overlay 'yas--field)))
         (evil-initialize-state 'insert))))
 
-  (defun +file-templates|add (regexp trigger mode &optional project-only-p)
-    (define-auto-insert
-      regexp
-      (vector `(lambda () (+file-templates--expand ,trigger ',mode ,project-only-p)))))
+  (defun +file-templates-add (args)
+    (destructuring-bind (regexp trigger mode &optional project-only-p) args
+      (define-auto-insert
+        regexp
+        (vector `(lambda () (+file-templates--expand ,trigger ',mode ,project-only-p))))))
 
-  (mapc (lambda (args) (apply #'+file-templates|add args))
+  (mapc #'+file-templates-add
         ;; General
         '(("/\\.gitignore$"                  "__"               gitignore-mode)
           ("/Dockerfile$"                    "__"               dockerfile-mode)

modules/feature/file-templates/templates/emacs-lisp-mode/__doom-module

@@ -1,3 +1,3 @@
-;;; `(file-relative-name buffer-file-name doom-modules-dir)`
+;;; `(file-relative-name buffer-file-name doom-modules-dir)` -*- lexical-binding: t; -*-
 
 $0

modules/feature/file-templates/templates/emacs-lisp-mode/__initfile

@@ -1,4 +1,4 @@
-;;; `(file-name-nondirectory buffer-file-name)`${1: --- ${2:description}}
+;;; `(file-name-nondirectory buffer-file-name)`${1: --- ${2:description}} -*- lexical-binding: t; -*-
 
 $0