fix: print queue isn't resetted on changelevel (fix #314)

inc/control.h

@@ -175,6 +175,10 @@ public:
       m_ent = ent;
    }
 
+   void resetFlushTimestamp () {
+      m_printQueueFlushTimestamp = 0.0f;
+   }
+
    int intValue (size_t arg) const {
       if (!hasArg (arg)) {
          return 0;

src/engine.cpp

@@ -85,6 +85,9 @@ void Game::levelInitialize (edict_t *entities, int max) {
    // install the sendto hook to fake queries
    util.installSendTo ();
 
+   // flush any print queue
+   ctrl.resetFlushTimestamp ();
+   
    // go thru the all entities on map, and do whatever we're want
    for (int i = 0; i < max; ++i) {
       auto ent = entities + i;