DRY and encapsulate client pods

[nkrkv]

Now in clients (browser and electron) the following pattern takes place:

• There are pods. Some are local to a concrete client, other are shared via xod-client
• There are “entry point pods”. One for each kind of client. It’s main container is App.jsx

The problem in that App.jsx. It has too many responsibilities and going to be messy.

• It contains code to wire up pods together and it contains code to wire various routines of particular pods not shared with outside world.
• App.jsx for xod-client-browser and xod-client-electron contain many duplicated code.

To make thing clearer the refactoring is required.

• Encapsulate as much local wiring in pods as possible inside pods and expose single PodName.jsx as an API for App.jsx which would simply place it in itself without any logic.
• Extract the common code of App.jsx to somewhere inside xod-client.