dir: Add COSMIC applet DE keys

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COSMIC applets use these keys, and they are harmless.
X-CosmicApplet marks them as an applet for the settings app and the
panel.
X-CosmicHoverPopup marks an applet that it wants a popup on hover if a
popup is open already in another applet.
X-CosmicOverflowPriority marks the priority of an applet for overflow
behavior in the panel.
X-CosmicOverflowMinSize marks the min size of the shrinkable applet in
applet size units.
X-CosmicShrinkable marks a window as having padding that can be
shrinkable in the panel so that it takes up less space.

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