Designable navigation view

[frederoni]

This PR adds a new NavigationView which will replace the RouteMapViewController’s view that's currently laid-out in the storyboard. A designable view of the whole UI encapsulating all other views.

Hooking it up to RouteMapViewController will be done in a subsequent PR so this change alone won't effectively change anything aside from:

• WayNameView merged into WayNameLabel
• Renamed LanesContainerView to LanesView

@JThramer @bsudekum 👀

[JThramer]

Awesome. Looks great so far!

[frederoni]

This PR is ready for review. As noted in the description, this change alone won't change anything aside from:

• WayNameView merged into WayNameLabel
• Renamed LanesContainerView to LanesView

[bsudekum]

Are there are always 4?

[frederoni]

Yep, this is only being used when rendering in Interface Builder so 5 mock lanes.

[bsudekum]

This namespace is really starting to get crowded 🙈.

[bsudekum]

Where are all these variables used?

[bsudekum]

Initial test feels good. Interested to hear feedback from @1ec5 & @JThramer too.

[JThramer]

The one major comment I have on this PR is this: Since this is no longer IB-based, it would be much cleaner to use a lazy var pattern to set up all of these child views, like so:

lazy var floatingStackView: UIStackView = { 
    let stack = UIStackView()
    stack.axis = .vertical
    stack.distribution = .equalSpacing
    stack.spacing = 8
    stack.translatesAutoresizingMaskIntoConstraints = false
    return stack
} ()

then, setupViews() becomes this:

func setupViews() {
    [..., floatingStackView, overviewButton, muteButton, reportButton, ...].forEach(addSubview(_:))
}

However, this does work for now, so if we want to just get this across the line then I'll happily take care of it in my PR.

[frederoni]

Totally agree about the lazy-loaded ivars. Even more if we decide to lazy-load localized strings. However, I'm going to merge this as is b/c the utilization of this class will be done in a subsequent PR which is when we can measure the impact.