louloulibs is directly included, instead of being a submodule

Because this is a nightmare to manage

louloulibs/utils/tolower.cpp

@@ -0,0 +1,13 @@
+#include <utils/tolower.hpp>
+
+namespace utils
+{
+  std::string tolower(const std::string& original)
+  {
+    std::string res;
+    res.reserve(original.size());
+    for (const char c: original)
+      res += static_cast<char>(std::tolower(c));
+    return res;
+  }
+}