louloulibs is directly included, instead of being a submodule

Because this is a nightmare to manage

louloulibs/utils/revstr.cpp

@@ -0,0 +1,9 @@
+#include <utils/revstr.hpp>
+
+namespace utils
+{
+  std::string revstr(const std::string& original)
+  {
+    return {original.rbegin(), original.rend()};
+  }
+}