feat+fix: cache versions and extra info in Modrinth packs

When you change a copy thinking you're changing the original data smh

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

launcher/ui/pages/modplatform/modrinth/ModrinthModel.h

@@ -64,6 +64,7 @@ class ModpackListModel : public QAbstractListModel {
 
     /* Retrieve information from the model at a given index with the given role */
     auto data(const QModelIndex& index, int role) const -> QVariant override;
+    bool setData(const QModelIndex &index, const QVariant &value, int role) override;
 
     inline void setActiveJob(NetJob::Ptr ptr) { jobPtr = ptr; }