Copy links with CopyToClipboard instead of a popup

Clicking a chat URL and the GUI's Donate/GitHub/Website buttons now put the address straight on the clipboard and say so in chat. The url link goes through ClassicAPI's LinkUtil handler registry, so SetItemRef is no longer replaced. Exporting a profile also copies the string.

env/translations_zhTW.lua

@@ -161,6 +161,7 @@ pfUI_translation["zhTW"] = {
   ["Cooldown Text Time Threshold"] = "技能冷卻時間文字臨界值",
   ["Coordinates Location"] = "座標位置",
   ["Coordinates On Minimap"] = "小地圖上的座標",
+  ["Copied to clipboard"] = nil,
   ["Count"] = "計數器",
   ["Create Profile"] = "新建配置",
   ["Ctrl-Click"] = "CTRL點擊",