sysDef refactor, part 3 - PLEASE READ

to cam900 and grauw: I have moved the per-system effect processing code
to sysDef.cpp as lambdas
you may want to do the same when you pull this commit.

src/engine/engine.h

@@ -208,8 +208,8 @@ struct DivSysDef {
     std::initializer_list<int> chTypes,
     std::initializer_list<DivInstrumentType> chInsType1,
     std::initializer_list<DivInstrumentType> chInsType2={},
-    EffectProcess fxHandler=NULL,
-    EffectProcess postFxHandler=NULL):
+    EffectProcess fxHandler=[](int,unsigned char,unsigned char) -> bool {return false;},
+    EffectProcess postFxHandler=[](int,unsigned char,unsigned char) -> bool {return false;}):
     name(sysName),
     nameJ(sysNameJ),
     id(fileID),