Implement a new system to handle "escape actions"

The new EscapeActions object decide what to do when the user press the
Escape key (such as closing a opened popup or inlined form).

This commit also re-introduced the sidebar current view as a sidebar
component local state.

client/components/cards/details.jade

@@ -26,7 +26,8 @@ template(name="cardDetails")
       h3 Description
       +inlinedForm(classNames="js-card-description")
         i.fa.fa-times.js-close-inlined-form
-        textarea(autofocus)= description
+        +editor(autofocus=true)
+          = description
         button(type="submit") {{_ 'edit'}}
       else
         .js-open-inlined-form