Changed manifest specification to include obfuscation/encryption of the length of the manifest. Now the entire package structure should be opaque after the header.
Updated crypto math to bc-csharp beta 4.
Disabled Fabric mux till further notice due to continuing intermittent issues, and general fragility. Can be tested with INCLUDE_FABRIC compilation flag.
Disabled CAST 5 & 6 block ciphers as they are old and possibly unsafe. They can be re-enabled with the compilation flag INCLUDE_CAST5AND6.