Redux: Move current search string state to global state

[artpi]

I'm talking about this:

Search term for posts / pages

Currently it is held in:

• state of Search component
• controller of my-sites/posts.
• Current url ?s=searchterm

This is a problem when switching sites, so I made this workaround:
https://github.com/Automattic/wp-calypso/pull/1091/files#r46399468

But I think it would be best if:

• search term was in Redux store
• changing url dispatched a redux action (or the other way around? we need 2-way binding here)
• components would just read from the store

Currently, all of this feels kinda hack-y

[lancewillett]

@artpi Do you suggest adding a new label for Redux work? Or maybe a new milestone?

[artpi]

I got sucked into hangouts, but I promise to describe in detail :) Problem I see right now is that search string is held in URL / component - I will describe when I find a moment

Filled out!

[artpi]

Also:
In the whole component tree above, siteID is either boolean or string.
Need to clean up this prop.

[lancewillett]

See also #453

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