Add support for hyperlinks in preview window

Close #2165

src/tui/tui.go

@@ -564,6 +564,8 @@ type Window interface {
 	CPrint(color ColorPair, text string)
 	Fill(text string) FillReturn
 	CFill(fg Color, bg Color, attr Attr, text string) FillReturn
+	LinkBegin(uri string, params string)
+	LinkEnd()
 	Erase()
 	EraseMaybe() bool
 }