Implements #228 adaptive MLS and smoothing channel

Could do with a lot of improvement, but moving in right direction

applications/reconstruct/src/main.cpp

@@ -246,7 +246,7 @@ static void run(ftl::Configurable *root) {
 
 	bool busy = false;
 
-	auto *smooth = ftl::config::create<ftl::filters::DepthSmoother>(root, "filters");
+	auto *smooth = ftl::config::create<ftl::filters::MLSSmoother>(root, "filters");
 
 	group->setLatency(4);
 	group->setName("ReconGroup");