feat: add configurable hotkeys to cycle tabs

Adds two configurable hotkeys (plus the required code infrastructure to
handle configurable hotkeys) for cycling the active chat tab forward by
one and backwards by one.

ChatTwo/Ui/SettingsTabs/ChatLog.cs

@@ -72,6 +72,18 @@ internal sealed class ChatLog : ISettingsTab
             ImGui.Separator();
             ImGui.Spacing();
 
+            ImGui.TextUnformatted(Language.Options_ChatTabForwardKeybind_Name);
+            ImGui.SetNextItemWidth(-1);
+            ImGuiUtil.KeybindInput("ChatTabForwardKeybind", ref Mutable.ChatTabForward);
+
+            ImGui.TextUnformatted(Language.Options_ChatTabBackwardKeybind_Name);
+            ImGui.SetNextItemWidth(-1);
+            ImGuiUtil.KeybindInput("ChatTabBackwardKeybind", ref Mutable.ChatTabBackward);
+
+            ImGui.Spacing();
+            ImGui.Separator();
+            ImGui.Spacing();
+
             ImGui.TextUnformatted(Language.Options_AdjustPosition_Name);
             var pos = Plugin.ChatLogWindow.LastWindowPos;
             ImGui.SetNextItemWidth(-1);