Vendor Teakra, make emulator own DSP RAM and add DSP RAM to fastmem (#806)

* DSP: Own DSP RAM and add it to fastmem

* Vendor Teakra

* Add MacOS support to fastmem

* Fix MacOS fastmem paths

* Fix iOS build

third_party/teakra/src/core_timing.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <algorithm>
+#include <functional>
+#include <limits>
+#include <vector>
+#include "common_types.h"
+
+namespace Teakra {
+
+class CoreTiming {
+public:
+    class Callbacks {
+    public:
+        virtual ~Callbacks() = default;
+        virtual void Tick() = 0;
+        virtual u64 GetMaxSkip() const = 0;
+        virtual void Skip(u64) = 0;
+        static constexpr u64 Infinity = std::numeric_limits<u64>::max();
+    };
+
+    void Tick() {
+        for (const auto& callbacks : registered_callbacks) {
+            callbacks->Tick();
+        }
+    }
+
+    u64 Skip(u64 maximum) {
+        u64 ticks = maximum;
+        for (const auto& callbacks : registered_callbacks) {
+            ticks = std::min(ticks, callbacks->GetMaxSkip());
+        }
+        for (const auto& callbacks : registered_callbacks) {
+            callbacks->Skip(ticks);
+        }
+        return ticks;
+    }
+
+    void RegisterCallbacks(Callbacks* callbacks) {
+        registered_callbacks.push_back(std::move(callbacks));
+    }
+
+private:
+    std::vector<Callbacks*> registered_callbacks;
+};
+} // namespace Teakra