[Feature request] - Allow part conversion of models.

[alexvalentine94]

Is your feature request related to a problem? Please describe.

Allow for greater flexibility with complex models to 'save'/isolote those solids which are successfully converted. Can be used in later conversion without need to restart and convert only in single instance.

Describe the solution you'd like

Method for partial conversion of a model and isolating any problematic solids. This relates to combining multiple step files into a single conversion.

Describe alternatives you've considered

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Additional context

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[alberto743]

Partially superposes to #80 and #114