added -Wno-gnu-zero-variadic-macro-arguments and fixed more warnings

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/minecraft/mod/ResourceFolderModel.h

@@ -330,7 +330,8 @@ void ResourceFolderModel::applyUpdates(QSet<QString>& current_set, QSet<QString>
 
         // When you have a Qt build with assertions turned on, proceeding here will abort the application
         if (added_set.size() > 0) {
-            beginInsertRows(QModelIndex(), m_resources.size(), m_resources.size() + added_set.size() - 1);
+            beginInsertRows(QModelIndex(), static_cast<int>(m_resources.size()),
+                            static_cast<int>(m_resources.size() + added_set.size() - 1));
 
             for (auto& added : added_set) {
                 auto res = new_resources[added];