[Maui] Add in a rating system

[tj-devel709]

An overview of how the changes look:

When the bad slider is dragged to the left, the rating is displayed in the button and the color changes to a dim red.

When the bad slider is dragged to the right, the rating is displayed in the button and the color changes to a bright red.

When the good slider is dragged to the left, the rating is displayed in the button and the color changes to a dim green.

When the good slider is dragged to the right, the rating is displayed in the button and the color changes to a bright green.

The changes are recorded to the exported .csv files, and the sliders are reset after each button choice!

[tj-devel709]

Changed the UI @jonathanpeppers so that the weight is shown in the labels below the slider!