Move top-level .cpp files into their respective folders (#1249)

* Update Makefile, move top-level .cpp files

* Move top-level .cpp files into their respective folders

cpp/scsiloop/scsiloop.cpp

@@ -0,0 +1,20 @@
+//---------------------------------------------------------------------------
+//
+// SCSI Target Emulator PiSCSI
+// for Raspberry Pi
+//
+// Copyright (C) 2022 Uwe Seimet
+// Copyright (C) 2022 akuker
+//
+//---------------------------------------------------------------------------
+
+#include "scsiloop/scsiloop_core.h"
+
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+	const vector<char *> args(argv, argv + argc);
+
+	return ScsiLoop().run(args);
+}