This follows the coding style guideline that the file that contains a
class should follow the exact name of this (main) class.
pubkey.{h|cpp} -> PublicKey.{h|cpp}
pubkey_utils.{h|cpp} -> PublicKeyUtils.{h|cpp}
Version.h held mostly stuff for protocol.h, which is a hub-specific file.
The only thing that we actually use is the PROTOCOL_VERSION in our code
and as such that one moved to the interfaces dir.
setting an incorrect value should not keep the old data after we already
update the fValid boolean.
That would give the user the impression that the data was removed while
it really isn't.
These are technically static libs, but not in any way shared libs.
They are used solely only by this repo and really only by the hub.
Most important, no header files are installed and basically none of
the normal rules for reusable libraries are applied to these files.
tomFlowee