Migrate to iced

[khanghugo]

iced seems like a nicer option for desktop app.

egui is fine for Waddy so far but not good enough.

It is possible that egui can still be in used by encapsulating the whole tree view inside another Window (main viewport contains Window that contains tree view). With this, some Waddy basic QoLs such as close confirmation or drag and drop are possible to implement.

[khanghugo]

gchimp-desktop rewritten in iced is under consideration. So far, the benefit would be less RAM usage for Waddy and easier integration between modules. For example, the result output of TexTile could be sent to Waddy with ease due to how iced is structured. Styling is also a lot more flexible though very arduous to figure the how-tos.

Currently, there is a WIP Waddy, which is basically the hardest part.