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/runtime/build.rs

@@ -0,0 +1,9 @@
+use substrate_wasm_builder::WasmBuilder;
+
+fn main() {
+  WasmBuilder::new()
+    .with_current_project()
+    .export_heap_base()
+    .import_memory()
+    .build()
+}