Removes Codable from definitions

Sources/Tonic/Chord.swift

@@ -6,7 +6,7 @@ import Foundation
 ///
 /// A representation of a chord as a set of note classes, with a root note class,
 /// and an inversion defined by the lowest note in the chord.
-public struct Chord: Equatable, Codable {
+public struct Chord: Equatable {
     /// Root note class of the chord
     public let root: NoteClass
 

Sources/Tonic/ChordType.swift

@@ -3,7 +3,7 @@
 import Foundation
 
 /// Chord type as defined by a set of intervals from a root note class
-public enum ChordType: String, CaseIterable, Codable {
+public enum ChordType: String, CaseIterable {
 
     /// Major Triad: Major Third, Perfect Fifth
     case majorTriad

Sources/Tonic/Key.swift

@@ -5,7 +5,7 @@ import Foundation
 /// The key is the set of notes that are played in a composition, or portion of a composition.
 ///
 /// A key is composed of a Root ``Note``, and a ``Scale``.
-public struct Key: Equatable, Codable {
+public struct Key: Equatable {
     /// The primary note class of the key, also known as the tonic
     public let root: NoteClass