Real "copy URL" & "copy path" context menu entries

Replace the poorly implemented 2-in-1 "copy address" media event
menu option with:

- Copy <mediaType> address: visible for non-encrypted media, always
  copies the http URL

- Copy local path: always visible for already downloaded media, even if
  they were downloaded before mirage was started

src/gui/Pages/Chat/Timeline/EventAudio.qml

@@ -13,6 +13,6 @@ AudioPlayer {
     HoverHandler {
         onHoveredChanged:
             eventDelegate.hoveredMediaTypeUrl =
-                hovered ? [Utils.Media.Audio, audio.source] : []
+                hovered ? [Utils.Media.Audio, audio.source, loader.title] : []
     }
 }