* Add build_dcli target and add it to CI
* Fix local imports for dcli
* And use local imports for all other files too
* Use local imports in tests and rlpx protocols
* simplify some modules
* mark several modules with raises
* fix clearing of keys in auth.nim
* fix keyfile case dropping off
* fix keyfile stream storage
* uuid should be output in lowercase
* enode: simplify API
* avoid mix of exceptions and return codes
* introduce result
* use deprecated compatibility API to avoid big-bang refactoring
* loosely based on nim-libp2p secp as well as the rust-secp256k1 wrapper
* oh, boy does our secp256k1 wrapper need updating - we're _far_
behind...