Add a deprecation comment.

lib/functions.zsh

@@ -176,7 +176,6 @@ function omz_urldecode {
   emulate -L zsh
   local encoded_url=$1
 
-  echo -e input $1
   # Work bytewise, since URLs escape UTF-8 octets
   local caller_encoding=$langinfo[CODESET]
   local LC_ALL=C
@@ -188,7 +187,6 @@ function omz_urldecode {
   tmp=${tmp:gs/\\/\\\\/}
   # Handle %-escapes by turning them into `\xXX` printf escapes
   tmp=${tmp:gs/%/\\x/}
-  echo -E "before decode $tmp"
   local decoded
   eval "decoded=\$'$tmp'"
 

plugins/terminalapp/terminalapp.plugin.zsh

@@ -0,0 +1,6 @@
+# This file is intentionally empty.
+#
+# The terminalapp plugin is deprecated and may be removed in a future release.
+# Its functionality has been folded in to the core lib/termsupport.zsh, which
+# is loaded for all users. You can remove terminalapp from your $plugins list
+# once all your systems are updated to the current version of Oh My Zsh.