Complete Add RegClass Functionality

[fconlon]

• [x] Criteria 1

Criteria 1

Given:

• The Add RegClass Window is open
• The user has entered valid data into all fields

When:

• The user clicks save

Then:

• The new RegClass will be added to the project
• The project will be saved to the IR .yaml file

[fconlon]

Reg Class is not saving properly