Add tinyfsm, start converting core functions to an FSM-based event loop

lib/tinyfsm/examples/elevator/main.cpp

@@ -0,0 +1,40 @@
+#include "fsmlist.hpp"
+
+#include <iostream>
+
+
+int main()
+{
+  fsm_list::start();
+
+  Call call;
+  FloorSensor sensor;
+
+  while(1)
+  {
+    char c;
+
+    std::cout << "c=Call, f=FloorSensor, a=Alarm, q=Quit ? ";
+    std::cin >> c;
+    switch(c) {
+    case 'c':
+      std::cout << "Floor ? ";
+      std::cin >> call.floor;
+      send_event(call);
+      break;
+    case 'f':
+      std::cout << "Floor ? ";
+      std::cin >> sensor.floor;
+      send_event(sensor);
+      break;
+    case 'a':
+      send_event(Alarm());
+      break;
+    case 'q':
+      std::cout << "Thanks for playing!" << std::endl;
+      return 0;
+    default:
+      std::cout << "Invalid input" << std::endl;
+    };
+  }
+}