Turned on all the warnings I could handle and made them into errors then fixed them all. Worldbuilder needs a refactor in random_path.

tests/fsm.cpp

@@ -25,7 +25,7 @@ public:
   }
 
   void START(MyEvent ev) {
-    println("<<< START");
+    println("<<< START {}", (int)ev);
     state(MyState::RUNNING);
   }
 
@@ -40,7 +40,7 @@ public:
   }
 
   void END(MyEvent ev) {
-    println("<<< STOP");
+    println("<<< STOP {}", (int)ev);
     state(MyState::END);
   }
 };