Prefab

Add missing dependencies.

- New method of defining and loading devices
- New method of defining models
- Server improvements, with progress status
- Multiple helpful functions for importing/exporting
- Multiple helpful functions for modifying device geometries
- Quick plotting functions
- Early method for "SEMulate" model, which generates SEM styling
- Simple functions for comparing geometries

Super small fix/cleanup.

Fix issue related to exporting designs with more than two hierarchy levels to GDS.

Added requirement for user to have authentication token.

Speed improvements.