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/Particle/CDecalDataFactory.cpp

@@ -5,6 +5,8 @@
 #include "Runtime/Graphics/CModel.hpp"
 #include "Runtime/Particle/CParticleDataFactory.hpp"
 
+#include <logvisor/logvisor.hpp>
+
 namespace metaforce {
 static logvisor::Module Log("metaforce::CDecalDataFactory");