Scale via MonoGame instead of using BQ's static images

BQ uses three different sizes of images (x1, x2, and x3) to handle scaling. Letting MonoGame handle up-scaling results in pixel-identical render, using `SamplerState.PointClamp`. This means less static images in the code and **far simpler** scaling logic.

Example:

![screenshot_092313_012032_am](https://f.cloud.github.com/assets/21165/1189972/f6d4d38e-2428-11e3-888d-8a9063db9473.jpg)