Refactor ExactMoon

[mannylopez]

API should be ExactMoon.moonPhase, ExactMoon.name, and ExactMoon.emoji instead of the verbose ExactMoon.exactMoonPhase, ExactMoon.exactName, and ExactMoon.exactEmoji.

extension TinyMoon {

  public struct ExactMoon: Hashable {

    // MARK: Lifecycle

    init(date: Date, phaseFraction: Double) {
      self.date = date
      exactMoonPhase = ExactMoon.exactMoonPhase(phaseFraction: phaseFraction)
      exactName = exactMoonPhase.rawValue
      exactEmoji = exactMoonPhase.emoji
    }

    // MARK: Public

    public let exactMoonPhase: MoonPhase
    public let exactName: String
    public let exactEmoji: String
    public let date: Date

    // MARK: Internal

    static func exactMoonPhase(phaseFraction: Double) -> MoonPhase {
      if phaseFraction < 0.02 {
        .newMoon
      } else if phaseFraction < 0.23 {
        .waxingCrescent
      } else if phaseFraction < 0.27 {
        .firstQuarter
      } else if phaseFraction < 0.48 {
        .waxingGibbous
      } else if phaseFraction < 0.52 {
        .fullMoon
      } else if phaseFraction < 0.73 {
        .waningGibbous
      } else if phaseFraction < 0.77 {
        .lastQuarter
      } else if phaseFraction < 0.98 {
        .waningCrescent
      } else {
        .newMoon
      }
    }
  }
}