Adds selective Element Model Attributes#231

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pgregorynz wants to merge 4 commits intomodelsbuilder:v8/devfrom

pgregorynz:v8/dev

Commits on Aug 8, 2019

Commits on Aug 20, 2019

Allows for selective base models
pgregorynz
committed

Commits on Jan 31, 2020

Allows for selective element models
pgregorynz
committed