Controller Remapping GUI v2 (#3144)

* Remapping GUI V2 - initial commit

* Unmap button with escape key

* Allow combination inputs

* Use separate class for SDL event signals so that i can work with the SDL window event loop

* Automatically pause game when GUI open to better manage event queue

* Move sd;_gamepad_added event from remap object to GUI object to avoid conflicts with sdl window

* Use signals on button/trigger to release to make GUI more responsive

* pause game while KBM window is open for consistency

* don't check gamepad when game is running to avoid conflicts

* Block all other sdl events instead of pausing game, automatic parse inputs after saving

* Don't block window restored or window exposed cases

* Properly exit event loop thread on exit

src/qt_gui/sdl_event_wrapper.h

@@ -0,0 +1,25 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+#include <QObject>
+#include <SDL3/SDL_events.h>
+
+namespace SdlEventWrapper {
+
+class Wrapper : public QObject {
+    Q_OBJECT
+
+public:
+    explicit Wrapper(QObject* parent = nullptr);
+    ~Wrapper();
+    bool ProcessEvent(SDL_Event* event);
+    static Wrapper* GetInstance();
+    static bool wrapperActive;
+    static Wrapper* WrapperInstance;
+
+signals:
+    void SDLEvent(int Type, int Input, int Value);
+};
+
+} // namespace SdlEventWrapper