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/parser.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <memory>
+#include <string>
+#include <vector>
+#include "common_types.h"
+
+namespace Teakra {
+
+class Parser {
+public:
+    virtual ~Parser() = default;
+    struct Opcode {
+        enum {
+            Invalid,
+            Valid,
+            ValidWithExpansion,
+        } status = Invalid;
+        u16 opcode = 0;
+    };
+
+    virtual Opcode Parse(const std::vector<std::string>& tokens) = 0;
+};
+
+std::unique_ptr<Parser> GenerateParser();
+
+} // namespace Teakra