Implements #233 cross support region for MLS

Colour MLS can optionally use a cross support region. It is currently a lot slower. In future it should also be adapted to be aware of significant non-crossable edges rather than just using colour information.

applications/reconstruct/src/main.cpp

@@ -303,9 +303,9 @@ static void run(ftl::Configurable *root) {
 	pipeline1->append<ftl::operators::Normals>("normals");  // Estimate surface normals
 	//pipeline1->append<ftl::operators::SmoothChannel>("smoothing");  // Generate a smoothing channel
 	//pipeline1->append<ftl::operators::ScanFieldFill>("filling");  // Generate a smoothing channel
-	pipeline1->append<ftl::operators::CrossSupport>("cross");
+	pipeline1->append<ftl::operators::CrossSupport>("cross")->set("enabled", false);
 	pipeline1->append<ftl::operators::ColourMLS>("mls");  // Perform MLS (using smoothing channel)
-	pipeline1->append<ftl::operators::VisCrossSupport>("viscross");
+	pipeline1->append<ftl::operators::VisCrossSupport>("viscross")->set("enabled", false);
 	// Alignment