feat(text-editing): add siren-insert module

Defines two functions for inserting en-dash and em-dash characters which
are typically difficult to type directly into Emacs.

core/siren-core-modules.el

@@ -105,6 +105,7 @@
 
 ;; Text editing
 (require 'siren-expand-region)
+(require 'siren-insert)
 (require 'siren-move-dup)
 (require 'siren-multiple-cursors)
 (require 'siren-randomize-region)

modules/text-editing/siren-insert.el

@@ -0,0 +1,21 @@
+;;; siren-insert.el --- jimeh's Emacs Siren: misc text insert functions
+
+;;; Commentary:
+
+;; Misc text insert functions for characters or text which is normally not easy
+;; to type in Emacs.
+
+;;; Code:
+
+(defun insert-en-dash ()
+  "Insert an en dash (U+2013, –)."
+  (interactive)
+  (insert ?\u2013))
+
+(defun insert-em-dash ()
+  "Insert an em dash (U+2014, —)."
+  (interactive)
+  (insert ?\u2014))
+
+(provide 'siren-insert)
+;;; siren-insert.el ends here