feat: add ChooseProviderDialog

Allows you to prompt the user for choosing a (mod) provider. This should
be fairly independent of the mod updater logic, so it can be used for
other ends later down the road :^)

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

launcher/ui/dialogs/ChooseProviderDialog.h

@@ -0,0 +1,56 @@
+#pragma once
+
+#include <QButtonGroup>
+#include <QDialog>
+
+namespace Ui {
+class ChooseProviderDialog;
+}
+
+namespace ModPlatform {
+enum class Provider;
+}
+
+class Mod;
+class NetJob;
+class ModUpdateDialog;
+
+class ChooseProviderDialog : public QDialog {
+    Q_OBJECT
+
+    struct Response {
+        bool skip_all = false;
+        bool confirm_all = false;
+
+        bool try_others = false;
+
+        ModPlatform::Provider chosen;
+    };
+
+   public:
+    explicit ChooseProviderDialog(QWidget* parent, bool single_choice = false, bool allow_skipping = true);
+    ~ChooseProviderDialog();
+
+    auto getResponse() const -> Response { return m_response; }
+
+    void setDescription(QString desc);
+
+   private slots:
+    void skipOne();
+    void skipAll();
+    void confirmOne();
+    void confirmAll();
+
+   private:
+    void addProviders();
+    void disableInput();
+
+    auto getSelectedProvider() const -> ModPlatform::Provider;
+
+   private:
+    Ui::ChooseProviderDialog* ui;
+
+    QButtonGroup m_providers;
+
+    Response m_response;
+};