* Began fleshing out libzudi.
  * Added prototypes for udi_channel_*.
* Increased the type safety of several functions in the fplainn::Channel domain.
* Renamed fplainn::Zudi::udi_channel_spawn(), to fplainn::Zudi::spawnEndpoint().
* Added prototype for fplainn::Zudi::anchorEndpoint().
* Moved fplainn::Zudi::spawnEndpoint out of udiServiceCalls.cpp and into
  zudi.cpp.

* Endpoints' private data can now be set from any thread, and not just the one
  to which they are anchored.