move headers to include/mcc to match duild and deploy configurations

move mcc_bsplines.h from fitpack to include/mcc
rewrite CMakeLists.txt to incorporate these changes

tests/mcc_telemetry_test.cpp

@@ -2,9 +2,9 @@
 
 #include <random>
 
-#include "mcc_pcm.h"
-#include "mcc_serializer.h"
-#include "mcc_telemetry.h"
+#include <mcc/mcc_pcm.h>
+#include <mcc/mcc_serializer.h>
+#include <mcc/mcc_telemetry.h>
 
 static std::random_device rd;
 static std::mt19937 gen(rd());