Alternate staged builders that handle optional, etc.

[Randgalt]

A variant of staged builders is available that only stages required record components. Any optional components (when addConcreteSettersForOptional is enabled) are not staged and are added to the final stage. Additionally, if Collection options are enabled, those too are added to the final stage.

Closes #170

attn: @olsavmic

Reviewers - please test various use cases. I'm not very familiar with this feature and did what I thought was right.