NOISSUE add shader pack page for instances

Only theme with an icon is simple colored, rest is TBD

launcher/pages/instance/ShaderPackPage.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "ModFolderPage.h"
+#include "ui_ModFolderPage.h"
+
+class ShaderPackPage : public ModFolderPage
+{
+    Q_OBJECT
+public:
+    explicit ShaderPackPage(MinecraftInstance *instance, QWidget *parent = 0)
+        : ModFolderPage(instance, instance->shaderPackList(), "shaderpacks",
+                        "shaderpacks", tr("Shader packs"), "Resource-packs", parent)
+    {
+        ui->actionView_configs->setVisible(false);
+    }
+    virtual ~ShaderPackPage() {}
+
+    virtual bool shouldDisplay() const override
+    {
+        return true;
+    }
+};