Enabled arcs render after adapting OpenCNCPilot code.

Started porting iosender to C++

terje/comms.cpp

@@ -0,0 +1,11 @@
+#include "comms.h"
+
+static iosender::StreamComms *currentCommunicator = nullptr;
+
+void iosender::Comms::SetCom(iosender::StreamComms *com) {
+    currentCommunicator = com;
+}
+
+iosender::StreamComms *iosender::Comms::GetCom() {
+    return currentCommunicator;
+}