Integrated SLAPrint into background processing.

Fixed couple of compiler warnings.

src/libslic3r/SLAPrint.cpp

@@ -0,0 +1,18 @@
+#include "SLAPrint.hpp"
+
+namespace Slic3r {
+
+void SLAPrint::clear()
+{
+}
+
+SLAPrint::ApplyStatus SLAPrint::apply(const Model &model, const DynamicPrintConfig &config)
+{
+	return APPLY_STATUS_INVALIDATED;
+}
+
+void SLAPrint::process()
+{
+}
+
+} // namespace Slic3r