support for interval in "show icon", "show arrow"
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@ -6,6 +6,11 @@ Shows the selected icon on the LED screen
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basic.showIcon(IconNames.Heart)
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```
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### Parameters
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* ``icon``, the identifier of the icon to display
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* ``interval`` (optional), the time to display in milliseconds. default is 400.
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### Example
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This program shows a happy face and then a sad face with the ``show icon`` function, with a one second pause in between.
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