Fully decouple hecl from Metaforce

- Added CStringExtras Convert functions
  (and UTF-compatible versions)
- GX header copied into Runtime
- SFX headers copied into Runtime/Audio

Runtime/Graphics/CTextureBoo.cpp

@@ -9,6 +9,8 @@
 #include "Runtime/GameGlobalObjects.hpp"
 #include "Runtime/Graphics/CGraphics.hpp"
 
+#include <logvisor/logvisor.hpp>
+
 namespace metaforce {
 namespace {
 logvisor::Module Log("metaforce::CTextureBoo");