feat(RD): add resource pack downloader

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/pages/modplatform/ResourcePackModel.cpp

@@ -0,0 +1,42 @@
+#include "ResourcePackModel.h"
+
+#include <QMessageBox>
+
+namespace ResourceDownload {
+
+ResourcePackResourceModel::ResourcePackResourceModel(BaseInstance const& base_inst, ResourceAPI* api)
+    : ResourceModel(api), m_base_instance(base_inst){};
+
+/******** Make data requests ********/
+
+ResourceAPI::SearchArgs ResourcePackResourceModel::createSearchArguments()
+{
+    auto sort = getCurrentSortingMethodByIndex();
+    return { ModPlatform::ResourceType::RESOURCE_PACK, m_next_search_offset, m_search_term, sort };
+}
+
+ResourceAPI::VersionSearchArgs ResourcePackResourceModel::createVersionsArguments(QModelIndex& entry)
+{
+    auto& pack = m_packs[entry.row()];
+    return { pack };
+}
+
+ResourceAPI::ProjectInfoArgs ResourcePackResourceModel::createInfoArguments(QModelIndex& entry)
+{
+    auto& pack = m_packs[entry.row()];
+    return { pack };
+}
+
+void ResourcePackResourceModel::searchWithTerm(const QString& term, unsigned int sort)
+{
+    if (m_search_term == term && m_search_term.isNull() == term.isNull() && m_current_sort_index == sort) {
+        return;
+    }
+
+    setSearchTerm(term);
+    m_current_sort_index = sort;
+
+    refresh();
+}
+
+}  // namespace ResourceDownload