[UI] Implemented Host Notifications

Splitted clases into:
 - ImGuiNotification
 - ImGuiHostNotification
 - ImGuiGuestNotification

To differentiate between Xenia toast notifications and notifications from titles itself

Adhoc:
Changed Screenshot into toast notification and switched from being binded to F10 to F12

src/xenia/ui/imgui_guest_notification.h

@@ -0,0 +1,82 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2023 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_IMGUI_GUEST_NOTIFICATION_H_
+#define XENIA_UI_IMGUI_GUEST_NOTIFICATION_H_
+
+#include "third_party/imgui/imgui.h"
+#include "xenia/ui/imgui_dialog.h"
+#include "xenia/ui/imgui_notification.h"
+
+/*
+
+*/
+
+namespace xe {
+namespace ui {
+class ImGuiGuestNotification : public ImGuiNotification {
+ public:
+  ImGuiGuestNotification(ui::ImGuiDrawer* imgui_drawer, std::string& title,
+                         std::string& description, uint8_t user_index,
+                         uint8_t position_id = 0);
+
+  ~ImGuiGuestNotification();
+
+ protected:
+  const ImVec2 default_notification_icon_size = ImVec2(58.0f, 58.0f);
+  const ImVec2 default_notification_margin_size = ImVec2(50.f, 5.f);
+  const float default_notification_text_scale = 2.3f;
+  const float default_notification_rounding = 30.f;
+  const float default_font_size = 12.f;
+
+  const ImVec4 white_color = ImVec4(1.0f, 1.0f, 1.0f, 1.0f);
+
+  const ImVec4 default_notification_background_color =
+      ImVec4(0.215f, 0.215f, 0.215f, 1.0f);
+  const ImVec4 default_notification_border_color = white_color;
+
+  enum class NotificationStage : uint8_t {
+    Awaiting = 0,
+    FazeIn = 1,
+    Present = 2,
+    FazeOut = 3,
+    Finished = 4
+  };
+
+  const bool IsNotificationExpired() {
+    return current_stage_ == NotificationStage::Finished;
+  }
+
+  void UpdateNotificationState();
+  const ImVec2 CalculateNotificationSize(ImVec2 text_size,
+                                         float scale) override;
+
+  virtual void OnDraw(ImGuiIO& io) {}
+
+  float notification_draw_progress_;
+
+ private:
+  NotificationStage current_stage_;
+};
+
+class AchievementNotificationWindow final : ImGuiGuestNotification {
+ public:
+  AchievementNotificationWindow(ui::ImGuiDrawer* imgui_drawer,
+                                std::string title, std::string description,
+                                uint8_t user_index, uint8_t position_id = 0)
+      : ImGuiGuestNotification(imgui_drawer, title, description, user_index,
+                               position_id) {};
+
+  void OnDraw(ImGuiIO& io) override;
+};
+
+}  // namespace ui
+}  // namespace xe
+
+#endif