Tidied up Color.swift
Tidied up Color.swift

RGB and HSV now convertible into CGColor.

HSV now lerpable.

SheffieldKevin/SwiftGraphics,rhcad/SwiftGraphics,hejunbinlan/SwiftGraphics,slightair/SwiftGraphics,sdesimone/SwiftGraphics,slightair/SwiftGraphics,Pretz/SwiftGraphics,slightair/SwiftGraphics,Pretz/SwiftGraphics,sdesimone/SwiftGraphics,sdesimone/SwiftGraphics,sdesimone/SwiftGraphics,SheffieldKevin/SwiftGraphics,marinehero/SwiftGraphics,rhcad/SwiftGraphics,rhcad/SwiftGraphics,hejunbinlan/SwiftGraphics,SheffieldKevin/SwiftGraphics,marinehero/SwiftGraphics,rhcad/SwiftGraphics,hejunbinlan/SwiftGraphics,hejunbinlan/SwiftGraphics,Pretz/SwiftGraphics,Pretz/SwiftGraphics,marinehero/SwiftGraphics,marinehero/SwiftGraphics,slightair/SwiftGraphics