MailKit macOS 12.0 Beta 4 to Beta 5 API Differences

MEExtensionManager.h
Added MEExtensionManager
Added +[MEExtensionManager reloadContentBlockerWithIdentifier:completionHandler:]
MEMessageActionDecision.h
Removed +[MEMessageActionDecision applyAction:]
Added +[MEMessageActionDecision decisionApplyingAction:]
Added +[MEMessageActionDecision decisionApplyingActions:]
MEMessageSecurityInformation.h
Added MEMessageSecurityInformation.shouldBlockRemoteContent
Added MEMessageSecurityInformation.localizedRemoteContentBlockingReason
Added -[MEMessageSecurityInformation initWithSigners:isEncrypted:signingError:encryptionError:shouldBlockRemoteContent:localizedRemoteContentBlockingReason:]