Remove unused roster code

louloulibs/xmpp/roster.cpp

-#include <xmpp/roster.hpp>
-
-RosterItem::RosterItem(const std::string& jid, const std::string& name,
-                       std::vector<std::string>& groups):
-  jid(jid),
-  name(name),
-  groups(groups)
-{
-}
-
-RosterItem::RosterItem(const std::string& jid, const std::string& name):
-  jid(jid),
-  name(name),
-  groups{}
-{
-}
-
-void Roster::clear()
-{
-  this->items.clear();
-}

louloulibs/xmpp/roster.hpp

-#pragma once
-
-
-#include <algorithm>
-#include <string>
-#include <vector>
-
-class RosterItem
-{
-public:
-  RosterItem(const std::string& jid, const std::string& name,
-             std::vector<std::string>& groups);
-  RosterItem(const std::string& jid, const std::string& name);
-  RosterItem() = default;
-  ~RosterItem() = default;
-  RosterItem(const RosterItem&) = default;
-  RosterItem(RosterItem&&) = default;
-  RosterItem& operator=(const RosterItem&) = default;
-  RosterItem& operator=(RosterItem&&) = default;
-
-  std::string jid;
-  std::string name;
-  std::vector<std::string> groups;
-
-private:
-};
-
-/**
- * Keep track of the last known stat of a JID's roster
- */
-class Roster
-{
-public:
-  Roster() = default;
-  ~Roster() = default;
-
-  void clear();
-
-  template <typename... ArgsType>
-  RosterItem* add_item(ArgsType&&... args)
-  {
-    this->items.emplace_back(std::forward<ArgsType>(args)...);
-    auto it = this->items.end() - 1;
-    return &*it;
-  }
-  RosterItem* get_item(const std::string& jid)
-  {
-    auto it = std::find_if(this->items.begin(), this->items.end(),
-                           [this, &jid](const auto& item)
-                           {
-                             return item.jid == jid;
-                           });
-    if (it != this->items.end())
-      return &*it;
-    return nullptr;
-  }
-  const std::vector<RosterItem>& get_items() const
-  {
-    return this->items;
-  }
-
-private:
-  std::vector<RosterItem> items;
-
-  Roster(const Roster&) = delete;
-  Roster(Roster&&) = delete;
-  Roster& operator=(const Roster&) = delete;
-  Roster& operator=(Roster&&) = delete;
-};
-
-