Add :os tty module

- Moves clipetty to its own, opt-in module (#2671, #3195, #3498)
- Fix cursor shape changing between evil states (#1994)
- Moves `xterm-mouse-mode` and `visible-cursor` config out of core.

modules/os/tty/packages.el

@@ -0,0 +1,12 @@
+;; -*- no-byte-compile: t; -*-
+;;; os/tty/packages.el
+
+(if (featurep! +osc)
+    (package! clipetty
+      :recipe (:host github :repo "spudlyo/clipetty")
+      :pin "01b39044b9b65fa4ea7d3166f8b1ffab6f740362")
+  ;; Despite its name, this works for macOS as well.
+  (package! xclip :pin "2951c6b62b29780c7a35c64601a59999b83aa145"))
+
+(when (featurep! :editor evil)
+  (package! evil-terminal-cursor-changer :pin "b49ca4393d2f3cc6014174950059b36a5cb22949"))