Move frontend-common to util/core

src/util/platform_misc.h

@@ -0,0 +1,20 @@
+// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
+
+#include "common/window_info.h"
+
+namespace FrontendCommon {
+void SuspendScreensaver();
+void ResumeScreensaver();
+
+/// Abstracts platform-specific code for asynchronously playing a sound.
+/// On Windows, this will use PlaySound(). On Linux, it will shell out to aplay. On MacOS, it uses NSSound.
+bool PlaySoundAsync(const char* path);
+
+#ifdef __APPLE__
+/// Add a handler to be run when macOS changes between dark and light themes
+void AddThemeChangeHandler(void* ctx, void(handler)(void* ctx));
+/// Remove a handler previously added using AddThemeChangeHandler with the given context
+void RemoveThemeChangeHandler(void* ctx);
+#endif
+} // namespace FrontendCommon