Now setting window height in the constructor.

We'll be adjusting the window height programmatically soon, so this
will let us change the height in XAML for designer purposes.
+Secondary text box. Window height now accommodates new text box.
+Storyboards for animating window width and commit text opacity.

- VisualStateManager seems to only apply to control templates.
- Using storyboards to control individual elements/properties.
- Naming things that need naming.
- Adjusting positioning of elements.
Now manually setting window startup position.

- Centers the window horizontally.
- Sets the window 35% of the vertical.
- This allows the expanded state.
+BeginStoryboard method and implementation for AppService.

Acts as a simple pass-through / wrapper for activating storyboards.