refactor: move more tied logic to model and move logic to the resources

This moves the QSortFilterProxyModel to the resource model files,
acessible via a factory method, and moves the sorting and filtering to
the objects themselves, decoupling the code a bit.

This also adds a basic implementation of methods in the
ResourceFolderModel, simplifying the process of constructing a new model
from it.

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

launcher/minecraft/mod/Mod.h

@@ -70,6 +70,9 @@ public:
 
     auto enable(bool value) -> bool;
 
+    [[nodiscard]] auto compare(Resource const& other, SortType type) const -> std::pair<int, bool> override;
+    [[nodiscard]] bool applyFilter(QRegularExpression filter) const override;
+
     // Delete all the files of this mod
     auto destroy(QDir& index_dir, bool preserve_metadata = false) -> bool;