begin moving position stuff into plugin

src/plugins/PositionPlugin.cpp

@@ -0,0 +1,13 @@
+#include "configuration.h"
+#include "PositionPlugin.h"
+#include "NodeDB.h"
+
+PositionPlugin positionPlugin;
+
+bool PositionPlugin::handleReceived(const MeshPacket &mp)
+{
+    auto &p = mp.decoded.data;
+    DEBUG_MSG("Received position from=0x%0x, id=%d, msg=%.*s\n", mp.from, mp.id, p.payload.size, p.payload.bytes);
+
+    return false; // Let others look at this message also if they want
+}