Function initialState

initialState(
    date: Date,
    lng: number,
    shadows?: boolean,
    enabled?: boolean,
): WidgetState
Build the initial WidgetState from an instant and longitude.
Parameters
- date: Date
  The UTC instant to start at.
- lng: number
  Longitude in degrees the solar time is referenced to.
- shadows: boolean = false
  Initial Shadows toggle state. Default false.
- enabled: boolean = true
  Initial master enable state. Default true.
Returns WidgetState
A fresh state with minute derived from date at lng.