Add a way to specify a minimum value for progress.

Add a way that prevents the progress from going below a specified `min` value.

Something similar to this:
```kotlin
var progress = 0f
    set(value) {
      field = if (value >= max) max
      else if (values <= min) min
      else value
      updateProgressView()
      onProgressChangeListener?.onChange(field)
    }
```