Guido 2.0.0

@jujuadams

Simple immediate mode GUI framework with reskinnable widgets.

Has the following widgets:

1. Momentary button
2. Hyperlink
3. Toggle button
4. Checkbox
5. Radio button
6. Tabs
7. Sliders (inc. min/max limits and base units)
8. Real-valued input field (inc. min/max limits and base units)
9. String input field
10. 2D button grid

Guido can also natively display:

1. Text
2. Wrapped text (using draw_text_ext)
3. Sprites
4. Surfaces