Added the ability to add nicknames for users (#2981)

Co-authored-by: Mm2PL <mm2pl+gh@kotmisia.pl>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/controllers/nicknames/NicknamesModel.cpp

@@ -0,0 +1,31 @@
+#include "NicknamesModel.hpp"
+
+#include "Application.hpp"
+#include "providers/twitch/api/Helix.hpp"
+#include "singletons/Settings.hpp"
+#include "util/StandardItemHelper.hpp"
+
+namespace chatterino {
+
+NicknamesModel::NicknamesModel(QObject *parent)
+    : SignalVectorModel<Nickname>(2, parent)
+{
+}
+
+// turn a vector item into a model row
+Nickname NicknamesModel::getItemFromRow(std::vector<QStandardItem *> &row,
+                                        const Nickname &original)
+{
+    return Nickname{row[0]->data(Qt::DisplayRole).toString(),
+                    row[1]->data(Qt::DisplayRole).toString()};
+}
+
+// turns a row in the model into a vector item
+void NicknamesModel::getRowFromItem(const Nickname &item,
+                                    std::vector<QStandardItem *> &row)
+{
+    setStringItem(row[0], item.name());
+    setStringItem(row[1], item.replace());
+}
+
+}  // namespace chatterino