Module entry point

When OCSF first attaches to or last detaches from a module, it initiates an OS-specific entry point. The entry points are _init and _fini. On attach, this function is responsible for calling CSSM_RegisterServices. On detach, it is responsible for calling CSSM_DeregisterServices. To avoid OS-related conflicts, any setup or cleanup operations should be performed in the module's Initialize and Terminate functions.