sizeInches is innacurate when device is in landscape mode

[dylanhand]

First of all thanks for your work on this library :)

If I'm not mistaken, since sizeInches only looks at the screen's height, it can be wrong about the device's size in some situations.

For example, a 12.9" iPad Pro in landscape mode happens to have a "height" of 1024, which results in sizeInches returning 9.7.

As another example, a 9.7" iPad in landscape mode has a "height" of 768, which results in sizeInches returning nil.

Is this known or by design? Maybe there's a way of correctly getting device size in landscape mode?

For reference, here's the code computing sizeInches:

extension Screen {
    public var sizeInches: Double? {
        switch (height, scale) {
        case (480, _): return 3.5
        case (568, _): return 4.0
        case (667, 3.0), (736, _): return 5.5
        case (667, 1.0), (667, 2.0): return 4.7
        case (812, 3.0): return 5.8
        case (896, 2.0): return 6.1
        case (896, 3.0): return 6.5
        case (1024, _): return ipadSize1024()
        case (1080, _): return 10.2
        case (1112, _): return 10.5
        case (1133, _): return 8.3
        case (1180, _): return 10.9
        case (1194, _): return 11.0
        case (1366, _): return 12.9
        default: return nil
        }
    }

    func ipadSize1024() -> Double {
        let deviceModel = UIDevice().dc.deviceModel
        switch deviceModel {
        case .iPadMini, .iPadMini2, .iPadMini3, .iPadMini4, .iPadMini5: return 7.9
        case .iPadPro10_5Inch: return 10.5
        default: return 9.7
        }
    }
}