Move the qt models to their own folder

Felt like the src folder was getting a bit crowded so move all the models to a folder named models.

src/emojitones.cpp

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: LGPL-2.0-or-later
 
 #include "emojitones.h"
-#include "emojimodel.h"
+#include "models/emojimodel.h"
 
 QMultiHash<QString, QVariant> EmojiTones::_tones = {
 #include "emojitones_data.h"