* Connect mouse over events to reducer actions
* Change Styling on hover
* Rename reducer actions to be more descriptive
* Reorder reducer in cascade
* Create centroid calculation util
* Whitespace
* Typo fix, use correct action
* Create centroid calc util
* Create centroid svg setup
* Refactor existing svg layer to toolSVG
* Change calcCentroid signature and centroidXY to match mapPointToScreen
* Add id and styling
* Run prettier
* Set z-index to 999
* Draw the label
* Introduce the centroid SVG, refactor code to allow both SVG layers
* Add text label and compute radius based on population
* Implement optional chaining
* Update font family
* Optimize calcMeanCentroid()
* Create and utilize calcMedianCentroid()
* Remove mass circle from label
* Remove styling change on hover
* Remove reducer action logs
* Prettier
* Swap out binds for arrow functions
* Style text
* switch from selectAll() to select()
* Reflect centroid container's purpose in id
* Remove mass from the output
* Swap to obj
* Add finite check
* Don't draw centroid if no finite values
* Fix finite check
* Remove log
* Toggle label coloring based on colorBy state
* Pass cursor events through centroid svg
Bruce Martin