Merge pull request #6 from calstar/stack-connector Updated CAS_physical, reduced pad diam by 1 mil

fix some relative paths

Added fixed symbol

Added 3D stack connectors

Added 3D models for stack connector

Modified IRIS symbols

Added more IRIS symbols

Merged IRIS symbols with star common library

Updated CAS_physical, reduced pad diam by 1 mil

updated to have heatsink be a pin, since is electrically isolated