[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_host_notification.h

@@ -0,0 +1,49 @@
+/**
+ ******************************************************************************
+ * 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_HOST_NOTIFICATION_H_
+#define XENIA_UI_IMGUI_HOST_NOTIFICATION_H_
+
+#include "third_party/imgui/imgui.h"
+#include "xenia/ui/imgui_dialog.h"
+#include "xenia/ui/imgui_drawer.h"
+#include "xenia/ui/imgui_notification.h"
+
+namespace xe {
+namespace ui {
+class ImGuiHostNotification : public ImGuiNotification {
+ public:
+  ImGuiHostNotification(ui::ImGuiDrawer* imgui_drawer, std::string& title,
+                        std::string& description, uint8_t user_index,
+                        uint8_t position_id = 10);
+
+  ~ImGuiHostNotification();
+
+ protected:
+  const ImVec2 CalculateNotificationSize(ImVec2 text_size,
+                                         float scale) override;
+
+  virtual void OnDraw(ImGuiIO& io) {}
+};
+
+class HostNotificationWindow final : ImGuiHostNotification {
+ public:
+  HostNotificationWindow(ui::ImGuiDrawer* imgui_drawer, std::string title,
+                         std::string description, uint8_t user_index,
+                         uint8_t position_id = 10)
+      : ImGuiHostNotification(imgui_drawer, title, description, user_index,
+                              position_id) {};
+
+  void OnDraw(ImGuiIO& io) override;
+};
+
+}  // namespace ui
+}  // namespace xe
+
+#endif