GUI: prepare for new chip picker

src/engine/engine.h

@@ -627,6 +627,9 @@ class DivEngine {
     // get japanese system name
     const char* getSystemNameJ(DivSystem sys);
     
+    // get sys definition
+    const DivSysDef* getSystemDef(DivSystem sys);
+    
     // convert sample rate format
     int fileToDivRate(int frate);
     int divToFileRate(int drate);

src/engine/sysDef.cpp

@@ -284,6 +284,10 @@ const char* DivEngine::getSystemNameJ(DivSystem sys) {
   */
 }
 
+const DivSysDef* DivEngine::getSystemDef(DivSystem sys) {
+  return sysDefs[sys];
+}
+
 bool DivEngine::isFMSystem(DivSystem sys) {
   if (sysDefs[sys]==NULL) return false;
   return sysDefs[sys]->isFM;