Add components for defining SICL-specific metaclasses to support system.
Add components for defining SICL-specific metaclasses to support system.

clasp-developers/SICL,clasp-developers/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL,clasp-developers/SICL,vtomole/SICL,vtomole/SICL