Implement request for user data erasure

This adds UI for MSC4025 to the account deactivation dialog, if the
server supports it. We also switch away from our
customDeactivateAccountJob to libQuotient's.

Fixes #670.

src/jobs/neochatdeactivateaccountjob.cpp

@@ -1,14 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Tobias Fella <tobias.fella@kde.org>
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#include "neochatdeactivateaccountjob.h"
-
-using namespace Quotient;
-
-NeoChatDeactivateAccountJob::NeoChatDeactivateAccountJob(const std::optional<QJsonObject> &auth)
-    : BaseJob(HttpVerb::Post, u"DisableDeviceJob"_s, "_matrix/client/v3/account/deactivate")
-{
-    QJsonObject data;
-    addParam<IfNotEmpty>(data, u"auth"_s, auth);
-    setRequestData(data);
-}

src/jobs/neochatdeactivateaccountjob.h

@@ -1,12 +0,0 @@
-// SPDX-FileCopyrightText: 2023 Tobias Fella <tobias.fella@kde.org>
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#pragma once
-
-#include <Quotient/jobs/basejob.h>
-
-class NeoChatDeactivateAccountJob : public Quotient::BaseJob
-{
-public:
-    explicit NeoChatDeactivateAccountJob(const std::optional<QJsonObject> &auth = {});
-};