Handle duplicate names in storyboard/xcasset files about r.swift HOT 4 CLOSED

Since this is all generated code, there's no problem with duplication, so you can definitely do both: Namespacing and merging structs.

This solves the issue for when you have an ambiguous name.
For example, when you have an image and a segue both named "hello", you can do: R.storyboard.Main.hello and R.assets.Main.hello.
And for unambiguous names, you can still use R.Main.goodbye.

However, you can't just leave out hello from R.Main, since that would be very annoying during development. I guess the best would be to create a dummy field of a different type, so a developer immediately knows what the issue is, e.g.: hello: AmbiguousFieldUseStoryboardOrAssets

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Or, you know, just include the full file name: R.Main.storyboard.hello and R.Main.xcassets.hello
This also scales to directory hierarchies.

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Hmm, think I like the explicit versions better. You don't want to think you get an UIImage by accessing R.main.hello and accidentally call the string overload, because it's a segue identifier. Let's try that first and optimize towards shorthands if real life development shows that's needed.

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Just discovered with @tomlokhorst that duplicate image names are a no-go even when in different asset folder. So that makes R.images.[name] possible.

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