Move NeoChatConnection and NeoChatRoom to LibNeoChat

Move `NeoChatConnection` and `NeoChatRoom` to `LibNeoChat` along with any required dependencies.

src/libneochat/events/widgetevent.h

@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2024 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <Quotient/events/simplestateevents.h>
+
+namespace Quotient
+{
+
+// Defined so we can directly switch on type.
+DEFINE_SIMPLE_STATE_EVENT(WidgetEvent, "im.vector.modular.widgets", QString, name, "name")
+
+} // namespace Quotient