Multiple improvements to the shutdown procedure

src/Compositor.hpp

@@ -101,6 +101,7 @@ public:
     bool                    m_bDPMSStateON = true;
     bool                    m_bUnsafeState = false; // unsafe state is when there is no monitors.
     bool                    m_bIsShuttingDown = false;
+    std::deque<uint64_t>    m_dProcessPIDsOnShutdown; // stores PIDs of apps to kill later when shutting down
 
     // ------------------------------------------------- //
 
@@ -172,7 +173,9 @@ public:
 
 private:
     void                    initAllSignals();
-    void                    setRandomSplash();    
+    void                    setRandomSplash();   
+
+    uint64_t                m_iHyprlandPID = 0; 
 };