Update the crafting page so that the check mark for each step only
appears when hovering over that step, and so that the check also has
some descriptive text helping the user understand what it does.
This introduces the new crafting page design featuring a new vertical
layout and list display of all crafting steps. It also makes it easy
to move items between the have/need sections and even from each step
into your inventory (causing a new crafting plan to be created which
doesn't plan on making that item).
* Convert the `BaseController.hide` and `show` methods to be much
more robust in the use of CSS transitions (using a timer in case a
transition doesn't actually fire).
* Change `hide`/`show` to use events for communicating animation
state instead of callbacks
* Convert several controllers to fire events for communication with
parent controllers instead of accepting functions.
* Rewrite the `CraftPageController`, `CraftPage` model and related
Jade/SCSS files to implement the new design.
* Alter the `InventoryController` and `StackController` to allow a
variety of action buttons, and for the events from those action
buttons to bubble up to parent controllers
* Add the `StepController` and its related model, template, and style
sheet as part of the new craft page.
* Tweak the `ItemSelectorController` and related files to allow for
a variety of styles for the launcher button
Andrew Miner