Add an initial Substrate instantiation

Consensus has been nuked for an AcceptAny currently routed throough PoW 
(when it doesn't have to be, doing so just took care of a few pieces of 
leg work).

Updates AGPL handling.

substrate/node/build.rs

@@ -0,0 +1,5 @@
+use substrate_build_script_utils::generate_cargo_keys;
+
+fn main() {
+  generate_cargo_keys();
+}