CME Enhanced Resend (issue #841)

[gbirchmeier]

This feature should be considered experimental until we officially state otherwise.

User docs will be at quickfixengine.org/n/documentation/cme-enhanced-resend.html shortly after this is merged.

I used the code in this branch (plus some uncontributed CME-Secure-Logon code) to pass 13 CME AutoCert+ scenarios:

1. Dropcopy CGW Session Management Tests - Logon Message
2. Drop Copy CGW - Mid-Week Key Rotation
3. Dropcopy CGW Sequencing Test - Receive Message Stream (No Resend)
4. Dropcopy CGW/MSGW Session Management Test - Beginning of week Logon
5. Dropcopy CGW/MSGW Session Management Test - Mid week Logon process
6. Dropcopy CGW/MSGW Sequencing Tests - Received encapsulated message from simulated Order Mass Action Messages
7. Dropcopy CGW/MSGW Sequencing Tests - Respond to Resend Request
8. Dropcopy CGW/MSGW Sequencing Tests - Bi-Directional Resend Request Scenario
9. Dropcopy CGW/MSGW Sequencing Tests - Process real-time messages during a Resend Response from CME Globex
10. Dropcopy CGW/MSGW Session Management Test - Logon Process with Failover
11. Dropcopy MSGW Session Management Tests - Logon Message
12. Drop Copy MSGW - Mid-Week Key Rotation
13. Dropcopy MSGW Sequencing Test - Receive Message Stream (No Resend)