Configure the state and event handlers for proper mouse dragginess

When the mouse moves, adjust x and w depending on what is being dragged

On mouse up envoke the Action to re-load the circles

Convert an x position relative to the beginning of the slider to a time in ms

Convert a time in ms to an x position relative to the beginning of the * slider. Can optionally provide a min and max object. defaults to using pr

When first in the page, set up change handlers

When the props are updating, set our x and w based on the start and end

When removing, clean up change handlers