Add a full-stack mint and burn test for Bitcoin and Monero

Fixes where ram_scanned is updated in processor. The prior version, while safe,
would redo massive amounts of work during periods of inactivity. It also hit an
undocumented invariant where get_eventuality_completions assumes new blocks,
yet redone work wouldn't have new blocks.

Modifies Monero's generate_blocks to return the hashes of the generated blocks.

coordinator/src/processors.rs

@@ -33,7 +33,7 @@ impl Processors for Arc<MessageQueue> {
 
     let network = match msg.from {
       Service::Processor(network) => network,
-      Service::Coordinator => panic!("coordinator sent coordinator message"),
+      Service::Coordinator => panic!("coordinator received coordinator message"),
     };
     let id = msg.id;