refactor: adapt rest of the codebase to the new resource model

In order to access the ModFolderModel from the ModFolderPage, i created
a new m_model for the correct type, shadowing the m_model of type
ResourceFolderModel. This creates two shared_ptr references to the same object,
but since they will have the same lifetime, it doesn't generate a memory
leak.

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

launcher/minecraft/mod/TexturePackFolderModel.cpp

@@ -35,24 +35,4 @@
 
 #include "TexturePackFolderModel.h"
 
-TexturePackFolderModel::TexturePackFolderModel(const QString &dir) : ModFolderModel(dir) {
-}
-
-QVariant TexturePackFolderModel::headerData(int section, Qt::Orientation orientation, int role) const {
-    if (role == Qt::ToolTipRole) {
-        switch (section) {
-            case ActiveColumn:
-                return tr("Is the texture pack enabled?");
-            case NameColumn:
-                return tr("The name of the texture pack.");
-            case VersionColumn:
-                return tr("The version of the texture pack.");
-            case DateColumn:
-                return tr("The date and time this texture pack was last changed (or added).");
-            default:
-                return QVariant();
-        }
-    }
-
-    return ModFolderModel::headerData(section, orientation, role);
-}
+TexturePackFolderModel::TexturePackFolderModel(const QString &dir) : ResourceFolderModel(QDir(dir)) {}