A new preference option for min/max text-size.
Made a new preference "MinMaxPreference", of which uses a new view (MinMaxBar) which allows there to be a minimum and maximum value set on one single slider.
I coded it to be rather useful for future use, it forces a minimum and maximum value for the slider.
Currently still have to implement saving/loading of the values.
Code is somewhat messy and will be cleaned.

Additionally going to be adding a preference to select a color for the background with a custom color selector.