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/crash.h

@@ -0,0 +1,11 @@
+#pragma once
+#include <cstdio>
+#include <cstdlib>
+
+[[noreturn]] inline void Assert(const char* expression, const char* file, int line) {
+    std::fprintf(stderr, "Assertion '%s' failed, file '%s' line '%d'.", expression, file, line);
+    std::abort();
+}
+
+#define ASSERT(EXPRESSION) ((EXPRESSION) ? (void)0 : Assert(#EXPRESSION, __FILE__, __LINE__))
+#define UNREACHABLE() Assert("UNREACHABLE", __FILE__, __LINE__)