Add check unuse for Xcode generated asset symbols

[duckSern1108]

Why?

Currently if image is used only be refer to generated asset symbols from Xcode, FengNiao is identifying as unused although this image is currently used in project like in this issue.

What changed?

• Add new search rule for Swift file to search for potential generated asset symbols access
• Add addtional code for filterUnused, convert resource name to camelCase then check with above potential case

Testing

I'm testing with my own project

let countryViews = [
    CountryView(position: .mid, img: .icNigeria),
    CountryView(position: .right, img: .icJapan),
    CountryView(position: .left, img: .icEngland),
    CountryView(position: .right, img: .icArgentina),
    CountryView(position: .left, img: .icBrazil),
]

final class CountryView: UIView {
    enum Position {
        case left
        case mid
        case right
    }
    
    var position: Position = .left
    var img: UIImage? = nil
    var pinPoint = UIView()
    
    
    init(position: Position, img: UIImage?) {
        self.position = position
        self.img = img
        super.init(frame: .zero)
    }
}

Before:



After: