fix: replace runtime waitIdle calls with a deletion queue

destrum/src/Graphics/DeletionQueue.cpp

@@ -0,0 +1,39 @@
+#include <destrum/Graphics/DeletionQueue.h>
+
+#include <cassert>
+#include <exception>
+
+#include <spdlog/spdlog.h>
+
+void DeletionQueue::push(std::uint64_t retiredInFrame, std::function<void()>&& deleter)
+{
+    // entries stay sorted by frame, flush only has to look at the front
+    assert(entries.empty() || entries.back().frame <= retiredInFrame);
+    entries.push_back(Entry{retiredInFrame, std::move(deleter)});
+}
+
+void DeletionQueue::flush(std::uint64_t lastCompletedFrame)
+{
+    while (!entries.empty() && entries.front().frame <= lastCompletedFrame) {
+        auto deleter = std::move(entries.front().deleter);
+        entries.pop_front();
+        try {
+            deleter();
+        } catch (const std::exception& e) {
+            spdlog::error("DeletionQueue: deleter threw: {}", e.what());
+        }
+    }
+}
+
+void DeletionQueue::flushAll()
+{
+    while (!entries.empty()) {
+        auto deleter = std::move(entries.front().deleter);
+        entries.pop_front();
+        try {
+            deleter();
+        } catch (const std::exception& e) {
+            spdlog::error("DeletionQueue: deleter threw: {}", e.what());
+        }
+    }
+}