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/gridfire.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "gridfire/engine/engine.h"
+#include "gridfire/exceptions/exceptions.h"
+#include "gridfire/io/io.h"
+#include "gridfire/partition/partition.h"
+#include "gridfire/policy/policy.h"
+#include "gridfire/reaction/reaction.h"
+#include "gridfire/screening/screening.h"
+#include "gridfire/solver/solver.h"
+#include "gridfire/trigger/trigger.h"
+#include "gridfire/utils/utils.h"
+
+#include "types/types.h"