applet: Surface middle-clickability in the UI

Merged Nate Graham requested to merge ngraham/bluedevil:surface-middle-click-in-the-UI into master

The Bluetooth System Tray applet can be middle-clicked to toggle Bluetooth on and off, but this is a hidden feature you would never discover if you didn't read Kai's blog. :) The feature is quite handy so let's expose it to more users by mentioning it in the tooltip subtext.

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Middle_click_to_enable_bluetooth Middle_click_to_disable_bluetooth

@teams/vdg @teams/usability


Please keep conceptual discussion ("do we really want to do this?") in plasma-workspace!2205 (merged) and only use this MR for design and implementation discussion. Thanks!

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