Fix crash with event watchers + handle SDL loop better + shut down more appropriately

src/frontend/KaizenGui.cpp

@@ -22,14 +22,6 @@ KaizenGui::KaizenGui() noexcept : window("Kaizen", 800, 600), core(std::make_sha
       core->Stop();
     }
   });
-
-  emuExitFunc = [&]() {
-    quit = true;
-    if (emuThread.isRunning) {
-      emuThread.requestInterruption();
-      while (emuThread.isRunning) {}
-    }
-  };
   
   about.setFunc([&]() {
     ImGui::Text("Kaizen is a Nintendo 64 emulator that strives");
@@ -63,7 +55,10 @@ KaizenGui::KaizenGui() noexcept : window("Kaizen", 800, 600), core(std::make_sha
           Util::panic("Error: {}", NFD::GetError());
         LoadROM(path.get());
       }},
-      {"Exit", std::move(emuExitFunc)}
+      {"Exit", [&]() {
+        quit = true;
+        emuThread.Stop();
+      }}
     }
   });
 
@@ -85,6 +80,10 @@ KaizenGui::KaizenGui() noexcept : window("Kaizen", 800, 600), core(std::make_sha
   }});
 }
 
+KaizenGui::~KaizenGui() {
+  gui::Cleanup();
+}
+
 void KaizenGui::RenderUI() {
   gui::StartFrame();
   statusBar.render();
@@ -114,17 +113,22 @@ void KaizenGui::LoadROM(const std::string &path) noexcept {
   Util::RPC::GetInstance().Update(Util::RPC::Playing, gameNameDB);
 }
 
-int KaizenGui::run() {
+void KaizenGui::run() {
   while(!quit) {
-    if(vulkanWidget.wsiPlatform->quitRequested) {
-      emuExitFunc();
+    emuThread.run();
+    SDL_Event e;
+    while (SDL_PollEvent(&e)) {
+      ImGui_ImplSDL3_ProcessEvent(&e);
+      switch(e.type) {
+        case SDL_EVENT_QUIT:
+          quit = true;
+          emuThread.Stop();
+          break;
+      }
     }
 
     RenderUI();
-    emuThread.run();
   }
-
-  return 0;
 }
 
 void KaizenGui::LoadTAS(const std::string &path) const noexcept {