Fix the "Crash on Exit" bug

We were throwing away the Dispatcher before all the keys (namely, leaked
keys) were unloaded. See the comment in plResManager for more details.

Sources/Plasma/NucleusLib/inc/plgDispatch.h

@@ -68,6 +68,8 @@ public:
     virtual void    MsgQueueOnOff(bool) = 0;      // Turn on or off Queued Messages, if off, uses MsgSend Immediately (for plugins)
 
     virtual bool    SetMsgBuffering(bool on) = 0; // On starts deferring msg delivery until buffering is set to off again.
+
+    virtual void    BeginShutdown() = 0;
 };
 
 class plgDispatch

Sources/Plasma/NucleusLib/pnDispatch/plDispatch.cpp

@@ -103,12 +103,14 @@ plDispatch::plDispatch()
 
 plDispatch::~plDispatch()
 {
-    int i;
-    for( i = 0; i < fRegisteredExactTypes.GetCount(); i++ )
-        delete fRegisteredExactTypes[i];
-
+    hsAssert(fRegisteredExactTypes.GetCount() == 0, "registered type after Dispatch shutdown");
     ITrashUndelivered();
+}
 
+void plDispatch::BeginShutdown()
+{
+    fRegisteredExactTypes.Reset();
+    ITrashUndelivered();
 }
 
 void plDispatch::ITrashUndelivered()

Sources/Plasma/NucleusLib/pnDispatch/plDispatch.h

@@ -131,6 +131,8 @@ public:
 
     virtual bool    SetMsgBuffering(bool on); // On starts deferring msg delivery until buffering is set to off again.
 
+    virtual void    BeginShutdown();
+
     static void SetMsgRecieveCallback(MsgRecieveCallback callback) { fMsgRecieveCallback = callback; }
 };
 
@@ -149,6 +151,8 @@ public:
     virtual void MsgQueue(plMessage* msg) {}
     virtual void MsgQueueProcess() {}
 
+    virtual void BeginShutdown() {}
+
 };
 
 #endif // plDispatch_inc

Sources/Plasma/PubUtilLib/plResMgr/plResManager.cpp

@@ -205,10 +205,11 @@ void plResManager::IShutdown()
     // TimerCallbackMgr is a fixed-keyed object, so needs to shut down before the registry
     plgTimerCallbackMgr::Shutdown(); 
 
-    // Destroy the dispatch. Note that we do this before the registry so that any lingering messages
-    // can free up keys properly
-    hsRefCnt_SafeUnRef(fDispatch);
-    fDispatch = nil;
+    // Formerly, we destroyed the Dispatcher here to clean up keys for leak reporting.
+    // However, if there are *real* leaked keys, then they will want to unload after this step.
+    // To unload, plKeyImp needs to dispatcher. SO, we're going to pitch everything currently in the
+    // Dispatcher and kill it later
+    fDispatch->BeginShutdown();
 
     // Just before we shut down the registry, page out any keys that still exist.
     // (They shouldn't... they're baaaaaad.)
@@ -224,9 +225,12 @@ void plResManager::IShutdown()
     fLoadedPages.clear();
 
     IUnlockPages();
-
     fLastFoundPage = nil;
 
+    // Now, kill off the Dispatcher
+    hsRefCnt_SafeUnRef(fDispatch);
+    fDispatch = nullptr;
+
     kResMgrLog(1, ILog(1, "   ...Shutdown successful!"));
 
     fInited = false;