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/test_generator.h

@@ -0,0 +1,5 @@
+#pragma once
+
+namespace Teakra::Test {
+bool GenerateTestCasesToFile(const char* path);
+}