Info bar dynamic message

The info bar currently works via mouse enter/leave events on elements that trigger changing it's content. This has 2 negative side effects:

1. Elements may accidentally clear content that is not set by themselves on mouse leave.
2. The generated content (such as path to current state) may change while the mouse remains inside the element.

A possible solution is to support setting the content to a command that is evaluated by the info bar on render. This command would then easily support updates based on the store.

For example:

{
    command: 'state-path',
    args: ['some-state-id']
}

Commands:

• state-path: state-id
• menu-item-help: item-id
• static-text: title subtitle

This would fix problem 2 as the menu would be have enough information to recompute the appropriate info text when the state changes.

Then since the commands are fixed a trigger can attach the command they sent with the clear request to ensure they only cancel the request they sent. This would fix problem 1.