Function to compute priorities for all AUNTiOptions and return a sorted Array of options and priorities

AUNTiOption.swift

    static func priorities(values: AUNTiValues) -> [(priority: Float, option: AUNTiOption)] {
        return all.map{ (priority: values.priority(forOption: $0), option: $0) }.sort{ $0.priority > $1.priority }
    }