Modify and restore NVIDIA control panel settings

Namely:
- Power profile for sunshine.exe
- Global OpenGL/Vulkan DXGI swapchain

src/platform/windows/nvprefs/nvprefs_common.h

@@ -0,0 +1,70 @@
+#pragma once
+
+// sunshine utility header for generic smart pointers
+#include "src/utility.h"
+
+// sunshine boost::log severity levels
+#include "src/main.h"
+
+// standard library headers
+#include <filesystem>
+#include <iostream>
+#include <map>
+#include <memory>
+#include <optional>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+// winapi headers
+// disable clang-format header reordering
+// clang-format off
+#include <windows.h>
+#include <aclapi.h>
+// clang-format on
+
+// nvapi headers
+// disable clang-format header reordering
+// clang-format off
+#include <nvapi.h>
+#include <NvApiDriverSettings.h>
+// clang-format on
+
+// boost headers
+#include <boost/json.hpp>
+
+namespace nvprefs {
+
+  struct safe_handle: public util::safe_ptr_v2<void, BOOL, CloseHandle> {
+    using util::safe_ptr_v2<void, BOOL, CloseHandle>::safe_ptr_v2;
+    explicit operator bool() const {
+      auto handle = get();
+      return handle != NULL && handle != INVALID_HANDLE_VALUE;
+    }
+  };
+
+  struct safe_hlocal_deleter {
+    void
+    operator()(void *p) {
+      LocalFree(p);
+    }
+  };
+
+  template <typename T>
+  using safe_hlocal = util::uniq_ptr<std::remove_pointer_t<T>, safe_hlocal_deleter>;
+
+  using safe_sid = util::safe_ptr_v2<void, PVOID, FreeSid>;
+
+  void
+  info_message(const std::wstring &message);
+
+  void
+  info_message(const std::string &message);
+
+  void
+  error_message(const std::wstring &message);
+
+  void
+  error_message(const std::string &message);
+
+}  // namespace nvprefs