Require purescript-font-lock dynamically to avoid self-recursive load

The features are not properly structured hierarchically into files so
as to allow sensible loading, so we work around this to load things as
needed.

Author: purcell

purescript-mode.el

@@ -35,7 +35,6 @@
 (require 'purescript-align-imports)
 (require 'purescript-sort-imports)
 (require 'purescript-string)
-(require 'purescript-font-lock)
 (require 'cl-lib)
 
 ;; All functions/variables start with `(literate-)purescript-'.
@@ -321,6 +320,7 @@ see documentation for that variable for more details."
   (set (make-local-variable 'parse-sexp-ignore-comments) nil)
   (set (make-local-variable 'indent-line-function) 'purescript-mode-suggest-indent-choice)
   ;; Set things up for font-lock.
+  (require 'purescript-font-lock)
   (set (make-local-variable 'font-lock-defaults)
        '(purescript-font-lock-choose-keywords
          nil nil ((?\' . "w") (?_  . "w")) nil