Avoid overflow and underflow of `length` and `distance`

• Replace x * x + y * y with hypot(x, y) (9feb2ea)
  • This prevents overflow and underflow during calculating length and distance. It makes it possible to pass the following tests.

XCTAssertEqual(CGPoint(x: .greatestFiniteMagnitude, y: 0.0).length, .greatestFiniteMagnitude)
XCTAssertEqual(CGPoint(x: 0.0, y: .leastNonzeroMagnitude).length, .leastNonzeroMagnitude)

Support only Swift 5.x

• Quit supporting Carthage
  • Xcode today supports SwiftPM.
• Remove CGAffineTransform * CGPoint (542c7ed)
• Remove CGSize * CGAffineTransform (653bd45)
• Support only Swift 5.0 and later

Swift 4.2 and API improvements

• Swift 4.2 and Xcode 10
• Renamed APIs
  • cos(angleFrom:) to cos(from:)
  • nealyEqual to isNealyEqual
• Support CGVector
• Add missing APIs
  • New operators
    • *(CGPoint, CGPoint) -> CGPoint, /(CGPoint, CGPoint) -> CGPoint
    • *=(inout CGPoint, CGPoint), /=(inout CGPoint, CGPoint)
    • Operators for mixed types
  • Full vector APIs for CGSize and CGVector same as CGPoint
• Remove CGAffineTransform.inverse

Fix `cos/angle(from:)` for zero vectors

• Swift 4.2 and Xcode 10
• Renamed APIs
  • cos(angleFrom:) to cos(from:)
  • nealyEqual to isNealyEqual
• Support CGVector
• Add missing APIs
  • New operators
    • *(CGPoint, CGPoint) -> CGPoint, /(CGPoint, CGPoint) -> CGPoint
    • *=(inout CGPoint, CGPoint), /=(inout CGPoint, CGPoint)
    • Operators for mixed types
  • Full vector APIs for CGSize and CGVector same as CGPoint
• Remove CGAffineTransform.inverse

Changes from 0.3.0-beta.2

• Fix cos/angle(from:) for zero vectors

Swift 4.2 and Xcode 10

• Swift 4.2 and Xcode 10
• Renamed APIs
  • cos(angleFrom:) to cos(from:)
  • nealyEqual to isNealyEqual
• Add lacked APIs
  • Full vector APIs for CGSize same as CGPoint
  • New operators
    • *(CGPoint, CGPoint) -> CGPoint, /(CGPoint, CGPoint) -> CGPoint
    • *=(inout CGPoint, CGPoint), /=(inout CGPoint, CGPoint)
    • Operators for mixed types
• Remove CGAffineTransform.inverse
• Extensions for CGVector

Refactored APIs and `CGVector` supports

• Renamed APIs
  • * to ⊗
  • cos(angleFrom:) to cos(from:)
  • nealyEqual to isNealyEqual
• Add lacked APIs
  • Full vector APIs for CGSize same as CGPoint
  • New operators
    • *(CGPoint, CGPoint) -> CGPoint, /(CGPoint, CGPoint) -> CGPoint
    • *=(inout CGPoint, CGPoint), /=(inout CGPoint, CGPoint)
    • Operators for mixed types
• Remove CGAffineTransform.inverse
• Extensions for CGVector

Update for Swift 4

• Support Swift 4
• Support swift-tools-version:4.0 for Swift Package Manager
• Support Carthage (iOS, macOS, tvOS, watchOS)