Dear ImGui Implementation (#598)

* added imgui as dependency

* imgui renderer/basic input implementation

* imgui: add layers system

Add video info layer to show fps. Press F10 to toggle it.

* imgui: add custom imgui config

* imgui: gamepad capture, stopping propagation

* imgui: changed config & log file path to use portable dir

* videoout: render blank frame when video output is closed

required to render imgui even when game has no video output

- fixed merge compile-error

src/imgui/layer/video_info.h

@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "imgui/imgui_layer.h"
+
+namespace Vulkan {
+class RendererVulkan;
+}
+namespace ImGui::Layers {
+
+class VideoInfo : public Layer {
+    bool m_show = false;
+    ::Vulkan::RendererVulkan* renderer{};
+
+public:
+    explicit VideoInfo(::Vulkan::RendererVulkan* renderer) : renderer(renderer) {}
+
+    void Draw() override;
+};
+
+} // namespace ImGui::Layers