Separate panel info from panel

[gardenofwine]

Currently, the info panel receives as its id parameter, the 'this.viewport.getActiveItem().xtype' of the current view.
If a panel is used twice but in different circumstances, like the Bills panel, it cannot have two different "info" text, because it is one panel, with one xtype.

A possible solution is to pass a key to the infoController, and have the infoController display its text according to that key.