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.cpp

@@ -0,0 +1,47 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "sdl_event_wrapper.h"
+
+using namespace SdlEventWrapper;
+
+Wrapper* Wrapper::WrapperInstance = nullptr;
+bool Wrapper::wrapperActive = false;
+
+Wrapper::Wrapper(QObject* parent) : QObject(parent) {}
+
+Wrapper* Wrapper::GetInstance() {
+    if (WrapperInstance == nullptr) {
+        WrapperInstance = new Wrapper();
+    }
+    return WrapperInstance;
+}
+
+bool Wrapper::ProcessEvent(SDL_Event* event) {
+    switch (event->type) {
+    case SDL_EVENT_WINDOW_RESTORED:
+        return false;
+    case SDL_EVENT_WINDOW_EXPOSED:
+        return false;
+    case SDL_EVENT_GAMEPAD_ADDED:
+        return false;
+    case SDL_EVENT_GAMEPAD_REMOVED:
+        return false;
+    case SDL_EVENT_QUIT:
+        emit SDLEvent(SDL_EVENT_QUIT, 0, 0);
+        return true;
+    case SDL_EVENT_GAMEPAD_BUTTON_DOWN:
+        emit SDLEvent(SDL_EVENT_GAMEPAD_BUTTON_DOWN, event->gbutton.button, 0);
+        return true;
+    case SDL_EVENT_GAMEPAD_BUTTON_UP:
+        emit SDLEvent(SDL_EVENT_GAMEPAD_BUTTON_UP, event->gbutton.button, 0);
+        return true;
+    case SDL_EVENT_GAMEPAD_AXIS_MOTION:
+        emit SDLEvent(SDL_EVENT_GAMEPAD_AXIS_MOTION, event->gaxis.axis, event->gaxis.value);
+        return true;
+    // block all other SDL events while wrapper is active
+    default:
+        return true;
+    }
+}
+Wrapper::~Wrapper() {}