[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.cc

@@ -0,0 +1,84 @@
+/**
+ ******************************************************************************
+ * 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. *
+ ******************************************************************************
+ */
+
+#include <cmath>
+#include <vector>
+
+#include "xenia/base/logging.h"
+#include "xenia/base/platform.h"
+#include "xenia/ui/imgui_host_notification.h"
+#include "xenia/ui/imgui_notification.h"
+
+namespace xe {
+namespace ui {
+
+ImGuiHostNotification::ImGuiHostNotification(ui::ImGuiDrawer* imgui_drawer,
+                                             std::string& title,
+                                             std::string& description,
+                                             uint8_t user_index,
+                                             uint8_t position_id)
+    : ImGuiNotification(imgui_drawer, NotificationType::Host, title,
+                        description, user_index, position_id) {
+  SetCreationTime(Clock::QueryHostUptimeMillis());
+  imgui_drawer->AddNotification(this);
+}
+
+ImGuiHostNotification::~ImGuiHostNotification() {}
+
+const ImVec2 ImGuiHostNotification::CalculateNotificationSize(ImVec2 text_size,
+                                                              float scale) {
+  const ImVec2 result = ImVec2(text_size.x * scale, text_size.y * scale);
+
+  return result;
+}
+
+void HostNotificationWindow::OnDraw(ImGuiIO& io) {
+  if (IsNotificationClosingTime()) {
+    delete this;
+    return;
+  }
+
+  const std::string longest_notification_text_line =
+      GetTitle().size() > GetDescription().size() ? GetTitle().c_str()
+                                                  : GetDescription().c_str();
+
+  const ImVec2 screen_size = io.DisplaySize;
+  const float window_scale =
+      std::fminf(screen_size.x / default_drawing_resolution.x,
+                 screen_size.y / default_drawing_resolution.y);
+  const float font_size = io.Fonts->Fonts[0]->FontSize;
+  const ImVec2 text_size = io.Fonts->Fonts[0]->CalcTextSizeA(
+      font_size * window_scale, FLT_MAX, -1.0f,
+      longest_notification_text_line.c_str());
+
+  const ImVec2 notification_size =
+      CalculateNotificationSize(text_size, window_scale);
+
+  const ImVec2 notification_position = CalculateNotificationScreenPosition(
+      screen_size, notification_size, GetPositionId());
+
+  if (isnan(notification_position.x) || isnan(notification_position.y)) {
+    return;
+  }
+
+  ImGui::SetNextWindowPos(notification_position);
+
+  ImGui::Begin("Notification Window", NULL, NOTIFY_TOAST_FLAGS);
+  {
+    ImGui::SetWindowFontScale(window_scale);
+
+    ImGui::Text(GetTitle().c_str());
+    ImGui::Separator();
+    ImGui::Text(GetDescription().c_str());
+  }
+  ImGui::End();
+}
+
+}  // namespace ui
+}  // namespace xe