Move NeoChatConnection and NeoChatRoom to LibNeoChat

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

src/libneochat/emojitones.h

@@ -0,0 +1,21 @@
+// SPDX-FileCopyrightText: None
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+#pragma once
+
+#include <QVariant>
+
+/**
+ * @class EmojiTones
+ *
+ * This class provides a _tones variable with the available emoji tones to EmojiModel.
+ *
+ * @sa EmojiModel
+ */
+class EmojiTones
+{
+private:
+    static QMultiHash<QString, QVariant> _tones;
+
+    friend class EmojiModel;
+};