Separated Print / PrintObject into PrintBase.cpp/h to support SLAPrint

src/libslic3r/PrintBase.cpp

@@ -0,0 +1,16 @@
+#include "PrintBase.hpp"
+
+namespace Slic3r
+{
+
+tbb::mutex& PrintObjectBase::cancel_mutex(PrintBase *print)
+{ 
+	return print->cancel_mutex();
+}
+
+std::function<void()> PrintObjectBase::cancel_callback(PrintBase *print)
+{ 
+	return print->cancel_callback();
+}
+
+} // namespace Slic3r