jlong4096

feat: new RoundRobin flow util

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## Motivation * Fixes #___ * ## Modifications * Introduce a new flow util similar to FanOut, but balances the work across go funcs. I feel like this could be...

Fix endDate trigger; add config options for period labels; trigger change for month-select, year-select, decade-select.

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Three updates we found useful while integrating this project into our application. 1. Selecting a new endDate will now trigger the callback. 2. Day/Month/Year etc labels are now configurable. 3....