core quality, part 3 - final

- SAA1099
- SCC
- SM8521
- Swan
- Virtual Boy

src/engine/platform/vb.h

@@ -59,6 +59,7 @@ class DivPlatformVB: public DivDispatch {
   bool modType;
   bool romMode;
   signed char modTable[32];
+  int coreQuality;
   VSU* vb;
   unsigned char regPool[0x600];
   void updateWave(int ch);
@@ -89,6 +90,7 @@ class DivPlatformVB: public DivDispatch {
     void poke(unsigned int addr, unsigned short val);
     void poke(std::vector<DivRegWrite>& wlist);
     const char** getRegisterSheet();
+    void setCoreQuality(unsigned char q);
     int init(DivEngine* parent, int channels, int sugRate, const DivConfig& flags);
     void quit();
     ~DivPlatformVB();