NightScout - Add Color Selectors

[IsThisPaul]

Add color selectors and color display code for in-range, high, low, urgent high, urgent low readings. Also for Clock, IOB, COB display Moved IOB and COB below reading when no graph is shown Cleaned up spacing in no-graph mode Cleaned up spacing for stale display with IOB or COB below reading

[tidbyt[bot]]

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