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/src/main.rs

@@ -0,0 +1,13 @@
+mod chain_spec;
+#[macro_use]
+mod service;
+
+mod command_helper;
+mod command;
+
+mod rpc;
+mod cli;
+
+fn main() -> sc_cli::Result<()> {
+  command::run()
+}