Refactoring louloulibs and cmake

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

src/xmpp/jid.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+
+#include <string>
+
+/**
+ * Parse a JID into its different subart
+ */
+class Jid
+{
+public:
+  explicit Jid(const std::string& jid);
+
+  Jid(const Jid&) = delete;
+  Jid(Jid&&) = delete;
+  Jid& operator=(const Jid&) = delete;
+  Jid& operator=(Jid&&) = delete;
+
+  std::string domain;
+  std::string local;
+  std::string resource;
+
+  std::string bare() const
+  {
+    return this->local + "@" + this->domain;
+  }
+  std::string full() const
+  {
+    std::string res = this->domain;
+    if (!this->local.empty())
+      res = this->local + "@" + this->domain;
+    if (!this->resource.empty())
+      res += "/" + this->resource;
+    return res;
+  }
+};
+
+/**
+ * Prepare the given UTF-8 string according to the XMPP node stringprep
+ * identifier profile.  This is used to send properly-formed JID to the XMPP
+ * server.
+ *
+ * If the stringprep library is not found, we return an empty string.  When
+ * this function is used, the result must always be checked for an empty
+ * value, and if this is the case it must not be used as a JID.
+ */
+std::string jidprep(const std::string& original);
+
+