refactor(RD): decouple ResourceModels from ResourcePages

This makes it so that we don't need a reference to the parent page in
the model. It will be useful once we change the page from a widget-based
one to a QML page.

It also makes tasks be created in the dialog instead of the page, so
that the dialog can also have the necessary information to mark versions
as selected / deselected easily. It also makes the task pointers into
smart pointers.

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

launcher/modplatform/flame/FlameModIndex.cpp

@@ -76,10 +76,10 @@ static QString enumToString(int hash_algorithm)
 void FlameMod::loadIndexedPackVersions(ModPlatform::IndexedPack& pack,
                                        QJsonArray& arr,
                                        const shared_qobject_ptr<QNetworkAccessManager>& network,
-                                       BaseInstance* inst)
+                                       const BaseInstance* inst)
 {
     QVector<ModPlatform::IndexedVersion> unsortedVersions;
-    auto profile = (dynamic_cast<MinecraftInstance*>(inst))->getPackProfile();
+    auto profile = (dynamic_cast<const MinecraftInstance*>(inst))->getPackProfile();
     QString mcVersion = profile->getComponentVersion("net.minecraft");
 
     for (auto versionIter : arr) {