Max font size refactor

[AZielinsky95]

This PR refactors dynamicTypeMaxSize to take in a CGFloat instead of a hardcoded enum value.

Other additions:

• Font extension for scaledFont ( Needed for scaling up font within AttributedString builder )
• Update init for NiceText with AttributedString
• Update example project

It occurred to me while putting up this PR that another option we have for supporting DynamicTypeSize without having users input arbitrary values for their maxFont size is to simply apply the same increments/decrements to base font size as done by apple shown here. That way scaling aligns with how the OS handles it. Only problem there is if Apple ever makes adjustments to the table they would have to be reflected here as well.

Example:

extension DynamicTypeSize {
    static func getMaxFontSize(_ baseSize: CGFloat, dyamicTypeSizeMax: DynamicTypeSize) -> CGFloat {
        switch dyamicTypeSizeMax {
        case .xSmall:
            return baseSize - 3.0
        case .small:
            return baseSize - 2.0
        case .medium:
            return baseSize - 1.0
        case .large:
            return baseSize
        case .xLarge:
            return baseSize + 2.0
            etc..

Let me know what you think @brendanlensink

[brendanlensink]

🛥️