Change access level modifiers

[angelolloqui]

In kotlin, the default access level for classes, members and variables is public, while in Swift is internal. As a result, when transpaling code we should also update the access level accordingly.

This code:

class ImplicitInternalClass {
    private let privateVar: Int = 1
    let implicitInternalVar: Int = 1
    internal let explicitInternalVar: Int = 1

    private class PrivateClass {
        private var privateVar: Int = 1
        var implicitPrivateVar: Int = 1

        class InheritedAccess {
            private var privateVar: Int = 1
            var implicitPrivateVar: Int = 1

            func inheritedAccessFunc() {}
        }

        func inheritedAccessFunc() {}
    }

    func implicitInternalFunc() {}
    internal func internalFunc() {}
    private func privateFunc() {}
}

Should produce

internal class ImplicitInternalClass {
    private val privateVar: Int = 1
    internal val implicitInternalVar: Int = 1
    internal val explicitInternalVar: Int = 1

    private class PrivateClass {
        private var privateVar: Int = 1
        var implicitPrivateVar: Int = 1

        class InheritedAccess {
            private var privateVar: Int = 1
            var implicitPrivateVar: Int = 1

            fun inheritedAccessFunc() {}
        }

        fun inheritedAccessFunc() {}
    }

    internal fun implicitInternalFunc() {}

    internal fun internalFunc() {}

    private fun privateFunc() {}
}