Units Tracked in App

[jgomez720]

Description

The units need to be tracked throughout the use of the app or when exporting. Specifically for BREP output formats. @franknoirot and I noticed this when we were doing the parametric modeling shelf bracket example.

Functionality

1. User selects Export Model
2. User defines any parameters that are needed for the export (file-specific parameters)

Example issue

@franknoirot and I were exporting the bracket into a STEP file. When we inserted it into a STEP viewer tool online we noticed that the units came out to meters, even though he was in cm in the app.