Refactor code to better support TEL with more code reuse

[SmithSamuelM]

Add data flow router. Extracted stream processor code from Kevery and put in data flow router so router can route both
KEL and TEL message types

Merge message types

Make Prefixer more generalized to support VC Registry etc inception class message data bodies.

[SmithSamuelM]

I fixed the Prefixer and and merged Ilks to support the VDR Fixed all the tests. Added code parameter to VDR.eventing.incept because generic Prefixer does not default the code.

[SmithSamuelM]

Left to do extract data flow router stream processor from Kevery