app: allow multiple variables as input to dashboard group-meter LED
When defining a dashboard group, allow specifying multiple variables as input to the group meter's LED. The LED is active when any of the specified variables evaluates to TRUE, and its color is the combination of the active variable colors. Remove the swap-busy variable, and use swap-reading and swap-writing as inputs to the swap group's LED instead, so that the LED's color indicates whether the swap is currently being read- from, written-to, or both.
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