[qt] refactor: qt_common lib (#94)

This is part of a series of PRs made in preparation for the QML rewrite. this PR specifically moves a bunch of utility functions from main.cpp into qt_common, with the biggest benefit being that QML can reuse the exact same code through ctx passthrough.

Also, QtCommon::Frontend is an abstraction layer over several previously Widgets-specific stuff like QMessageBox that gets used everywhere. The idea is that once QML is implemented, these functions can have a Quick version implemented for systems that don't work well with Widgets (sun) or for those on Plasma 6+ (reduces memory usage w/o Widgets linkage) although Quick from C++ is actually anal, but whatever.

Other than that this should also just kinda reduce the size of main.cpp which is a 6000-line behemoth rn, and clangd straight up gives up with it for me (likely caused by the massive amount of headers, which this DOES reduce).

In the future, I probably want to create a common strings lookup table that both Qt and QML can reference--though I'm not sure how much linguist likes that--which should give us a way to keep language consistent (use frozen-map).

TODO: Docs for Qt stuff

Co-authored-by: MaranBr <maranbr@outlook.com>
Reviewed-on: eden-emu/eden#94
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>

src/qt_common/qt_game_util.h

@@ -0,0 +1,85 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef QT_GAME_UTIL_H
+#define QT_GAME_UTIL_H
+
+#include <QObject>
+#include <QStandardPaths>
+#include "common/fs/path_util.h"
+
+namespace QtCommon::Game {
+
+enum class InstalledEntryType {
+    Game,
+    Update,
+    AddOnContent,
+};
+
+enum class GameListRemoveTarget {
+    GlShaderCache,
+    VkShaderCache,
+    AllShaderCache,
+    CustomConfiguration,
+    CacheStorage,
+};
+
+enum class ShortcutTarget {
+    Desktop,
+    Applications,
+};
+
+enum class ShortcutMessages{
+    Fullscreen = 0,
+    Success = 1,
+    Volatile = 2,
+    Failed = 3
+};
+
+bool CreateShortcutLink(const std::filesystem::path& shortcut_path,
+                        const std::string& comment,
+                        const std::filesystem::path& icon_path,
+                        const std::filesystem::path& command,
+                        const std::string& arguments,
+                        const std::string& categories,
+                        const std::string& keywords,
+                        const std::string& name);
+
+bool MakeShortcutIcoPath(const u64 program_id,
+                         const std::string_view game_file_name,
+                         std::filesystem::path& out_icon_path);
+
+void OpenEdenFolder(const Common::FS::EdenPath &path);
+void OpenRootDataFolder();
+void OpenNANDFolder();
+void OpenSDMCFolder();
+void OpenModFolder();
+void OpenLogFolder();
+
+void RemoveBaseContent(u64 program_id, InstalledEntryType type);
+void RemoveUpdateContent(u64 program_id, InstalledEntryType type);
+void RemoveAddOnContent(u64 program_id, InstalledEntryType type);
+
+void RemoveTransferableShaderCache(u64 program_id, GameListRemoveTarget target);
+void RemoveVulkanDriverPipelineCache(u64 program_id);
+void RemoveAllTransferableShaderCaches(u64 program_id);
+void RemoveCustomConfiguration(u64 program_id, const std::string& game_path);
+void RemoveCacheStorage(u64 program_id);
+
+// Metadata //
+void ResetMetadata();
+
+// Shortcuts //
+void CreateShortcut(const std::string& game_path,
+                    const u64 program_id,
+                    const std::string& game_title_,
+                    const ShortcutTarget& target,
+                    std::string arguments_,
+                    const bool needs_title);
+
+constexpr std::string GetShortcutPath(ShortcutTarget target);
+void CreateHomeMenuShortcut(ShortcutTarget target);
+
+}
+
+#endif // QT_GAME_UTIL_H