Re: [w3c/manifest] Ability to dynamically change app icon (#663)

@NotWoods @mgiuca let me picture out my case...

In many universities and colleges, at least in Russia (not sure about other countries) it's normal to have part of your schedule to be determined by that fact if the week even or odd. There are some weird rules how numbers of weeks is determined ([ISO 8601](https://en.wikipedia.org/wiki/ISO_8601#Week_dates)). Often students forget what's the next week is (or previous was). So then I've created a little website showing the current week's status:

https://chiliz.ru


It simply prints "Числитель" or "Знаменатель", which means if the week is even or odd, accordingly. It has some logo:

<img src="https://user-images.githubusercontent.com/13215662/66992703-ae0f6e00-f0e3-11e9-8074-fc691b00e956.png" alt="image" /> <sup><a href="https://worldvectorlogo.com/logo/react-1">(remind something?)</a></sup>

So it has only two states and changes once a week (binary data). So this idea of dynamic icon change fits quite naturally here. For example, it may change between two icons like these (quickly created it just now just to demonstrate the idea):

![sketch3](https://user-images.githubusercontent.com/13215662/66995181-fd579d80-f0e7-11e9-82aa-d3a903683b9b.png)
![sketch4](https://user-images.githubusercontent.com/13215662/66995182-fd579d80-f0e7-11e9-88a8-7079217c790c.png)

<sup>P.S. btw, I don't study, I've completed college several years ago (still learning though)
P.P.S. «Числитель или Знаменатель» pronounced like: «chislitel' ili zhnamenatel'», shortly «chiliz»</sup>


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