Shape Overall Scale Epic

[akenmorris]

This is the parent issue for all overall scale issues for ShapeWorks.

• Studio: Glyph Slider needs to dynamically adjust to overall shape scale #2459
• Optimization: Image spacing greatly affects surface sampling #1227
• ShapeWorks Scale Invariance and Adaptive Particle Splitting #670
• Groom: Blur needs to be spacing aware #2461
• Sampling and correspondence are combined without normalization, so the balance depends on the data rather than on relative_weighting #2649