feat(invlerp, transfer-function): auto invlerp range

[seankmartin]

Allows auto setting the data range on invlerp widgets to the min - max, 1 - 99, or 5 - 95.

Related to #482

Other changes

1. Transfer functions no longer bake their default points into the JSON state. This will make it more future proof, and allow to be more flexible with the design of defaults.
2. This includes the changes from fix(volume-rendering): correct data access for histogram in volume rendering with unequal chunk sizes #632, otherwise when computing auto limits in 3D, the lower limit can bounce around. In addition, without these fixes, the 3D auto-limit is often quite removed from the 2D. The 2D/3D auto limit mismatch remains due to the differences in calculation, but is reduced.
3. Transfer functions get a clear points button.
4. Transfer functions will auto update the points to match the bounds unless:
   a. The points are manually changed by the user.
   b. The points have been loaded from the JSON state.
   c. Clearing the points re-enables auto-update, clearing it from a and b.