Use personal fork of highlight-escape-sequences

Improves elisp support, adds support for more modes and fixes some minor
issues.

core/core-ui.el

@@ -144,21 +144,7 @@ Also see `doom-exit-buffer-hook'.")
 
 ;; `highlight-escape-sequences'
 (def-package! highlight-escape-sequences
-  :after-call after-find-file
+  :hook ((prog-mode conf-mode) . highlight-escape-sequences-mode))
-  :config
-  (defconst hes-python-escape-sequence-re
-    (rx (submatch
-         (and ?\\ (submatch
-                   (or (repeat 1 3 (in "0-7"))
-                       (and ?x (repeat 2 xdigit))
-                       (and ?u (repeat 4 xdigit))
-                       (and ?U (repeat 8 xdigit))
-                       (and ?N "{" (one-or-more alpha) "}")
-                       (any "\"\'\\abfnrtv")))))))
-  (add-to-list 'hes-mode-alist `(python-mode . ,hes-python-escape-sequence-re))
-
-  (add-to-list 'hes-mode-alist `(enh-ruby-mode . ,hes-ruby-escape-sequence-keywords))
-  (hes-mode +1))
 
 ;; `rainbow-delimiters' Helps us distinguish stacked delimiter pairs. Especially
 ;; in parentheses-drunk languages like Lisp.

core/packages.el

@@ -11,7 +11,8 @@
 (package! hide-mode-line)
 (package! highlight-indentation)
 (package! highlight-numbers)
-(package! highlight-escape-sequences)
+(package! highlight-escape-sequences
+  :recipe (:fetcher github :repo "hlissner/highlight-escape-sequences"))
 (unless (boundp 'display-line-numbers)
   (package! nlinum)
   (package! nlinum-hl)