Fix comments and newlines within operator definitions

Fix handling of conversion operators where the operator is split over multiple lines or
has comments within the operator type.

Also fix similar problem with normal operators which gave a syntax error if split over
multiple lines or had a comment within the operator declaration.

Closes #401

Examples/test-suite/operator_overload_break.i

@@ -12,6 +12,10 @@
 %rename(PlusPlusPostfix) operator++(int);
 #endif
 
+%ignore operator new (size_t);
+%ignore operator delete (void *);
+%ignore operator delete[] (void *);
+
 %{
 #include <iostream>
 using namespace std;
@@ -58,6 +62,11 @@ public:
     void PrintK() {std::cerr << k << std::endl;}
 
     int k;
+    void *operator new
+         (size_t); // definition split over two lines was giving syntax error
+    void operator delete /* comment here did not work */ (void *);
+    void operator
+         delete[] (void *);
 };
 
 %}