replace combined stateUpdated signal with individual events

src/ui/GameWorldView.h

@@ -47,7 +47,6 @@ public:
 
 signals:
     void selectionChanged(const std::vector<BuildingId>& ids);
-    void stateUpdated(Tick tick, int blocks, double speed, int bossCounter, Tick bossCountdownTicks);
     void gameOver();
     void builderModeExited();
     void blueprintModeExited();
@@ -173,4 +172,9 @@ private:
     bool m_scrollLeft;
     bool m_scrollRight;
     bool m_gameOverShown;
+
+    Tick m_lastTick          = Tick(-1);
+    int  m_lastBlocks        = -1;
+    int  m_lastBossCounter   = -1;
+    Tick m_lastBossCountdown = Tick(-1);
 };