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/.gitignore

@@ -0,0 +1,39 @@
+# Build directory
+[Bb]uild/
+cmake-build/
+doc-build/
+
+test/
+
+# Generated source files
+src/common/scm_rev.cpp
+
+# Project/editor files
+*.swp
+.idea/
+.vs/
+.vscode/
+
+# *nix related
+# Common convention for backup or temporary files
+*~
+
+# Visual Studio CMake settings
+CMakeSettings.json
+
+# OSX global filetypes
+# Created by Finder or Spotlight in directories for various OS functionality (indexing, etc)
+.DS_Store
+.AppleDouble
+.LSOverride
+.Spotlight-V100
+.Trashes
+
+# Windows global filetypes
+Thumbs.db
+
+teakra.out
+teakra.out.*
+
+# cmake and ctest temporary files
+/Testing