core quality, part 3 - final

- SAA1099
- SCC
- SM8521
- Swan
- Virtual Boy

src/engine/platform/swan.h

@@ -53,6 +53,7 @@ class DivPlatformSwan: public DivDispatch {
   };
   FixedQueue<QueuedWrite,256> writes;
   FixedQueue<DivRegWrite,2048> postDACWrites;
+  int coreQuality;
   WSwan* ws;
   void updateWave(int ch);
   friend void putDispatchChip(void*,int);
@@ -78,6 +79,7 @@ class DivPlatformSwan: 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();
     ~DivPlatformSwan();