EngineBlock 4.6.0

Logging enhancements and removed outbound response caching.

• Improve logging performed during single sign-on
• Log raw SAML HTTP requests when additional logging is requested
• Research logging efficacy after various types of PHP errors and exceptions
• Reconcile "system log" and "session log"
• EB 4.4 reissues cached responses on Authn requests from any SP #179