Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

src/utils/split.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+
+#include <string>
+#include <vector>
+
+namespace utils
+{
+  std::vector<std::string> split(const std::string &s, const char delim, const bool allow_empty=true);
+}
+
+