chore(spelling): add codespell pre-commit hook

Fixes spelling mistakes identified by it.

addons/godot_xterm/native/src/constants.cpp

@@ -20,7 +20,7 @@ const char* Terminal::FONT_TYPES[4] = {
 };
 
 const Terminal::KeyMap Terminal::KEY_MAP = {
-    // Godot does not have seperate scancodes for keypad keys when NumLock is
+    // Godot does not have separate scancodes for keypad keys when NumLock is
     // off. We can check the unicode value to determine whether it is off and
     // set the appropriate scancode. Based on the patch which adds support for
     // this to TextEdit/LineEdit:

addons/godot_xterm/native/src/pty_unix.cpp

@@ -377,7 +377,7 @@ Dictionary PTYUnix::fork(
     }
   }
 
-  // reenable signals
+  // re-enable signals
   pthread_sigmask(SIG_SETMASK, &oldmask, NULL);
 
   switch (pid) {