[FIX] ConnectedComponent: keep props uptodate

This is a tricky bug. The problem is that a ConnectedComponent can
trigger a rendering before it is aware that there is a state change in
the store, and just before the store update event comes in.

What we do in this commit is to update the storeProps whenever a
rendering is scheduled.  However, we need to keep the rendering
information as a promise to give it in some case to the __checkUpdate
method (see the note in the render method)

closes #268

tests/store/__snapshots__/connected_component.test.ts.snap

@@ -15,3 +15,7 @@ exports[`connecting a component to store deep and shallow connecting a component
 exports[`connecting a component to store deep and shallow connecting a component 3`] = `"<div><span>Bertinchamps</span></div>"`;
 
 exports[`connecting a component to store deep and shallow connecting a component 4`] = `"<div><span>Kasteel</span></div>"`;
+
+exports[`various scenarios scenarios with async store updates and some components events 1`] = `"<div><button>Do stuff</button><div><span>Attachment 100</span><span>Name: text.txt</span></div></div>"`;
+
+exports[`various scenarios scenarios with async store updates and some components events 2`] = `"<div><button>Do stuff</button></div>"`;