docs(ridfire)

Added more documentation, also moved all engine code into
gridfire::engine namespace to be more in line with other parts of teh
code base

src/include/gridfire/utils/utils.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "gridfire/utils/formatters/formatters.h"
+#include "gridfire/utils/hashing.h"
+#include "gridfire/utils/logging.h"
+#include "gridfire/utils/sundials.h"
+#include "gridfire/utils/table_format.h"