licence: remove various GPLv3 copyright headers;

event_new: remove unused package that had been copied for discussion

monax: lingering eris -> monax company rename

licence: last pass, further cleanup

rpc: add AssertIsRPCResponse as marker method for restricting implementation of interface to actual RPCResponse types

client: DumpStorage; rpc/tendermint: util to unwrap to core types, preventing exposure of internal types to client

Refactored tests to make more manageable, made pass against updated types, fixed issues that were uncovered