Apply new format and include generated files in build

[Hot-key]

This PR updates the godot_pixelorama_importer plugin:

1. PXO Format Update:

   • Applied changes to support the updated PXO file format

2. Export Process Improvement:

   • Include files generated by the plugin in the project export

Tested with files created in Pixelorama version: [v1.0.2] - 2024-08-21

[Technohacker]

Thanks for the PR! It's been a while since I've last used the plugin myself so it may take me a while to get to this 😅

That being said, is there any reason the save path needs to be changed from the Godot-provided one?

[Hot-key]

It wouldn't be an issue to iterate through the .godot/imported directory and use regex to find .pxo files. However, as this is my first time writing a Godot plugin, I separated it externally for convenience in testing and development.

If you prefer, I can move it to a folder like .godot/pixelorama, or keep it within .godot/imported and use regex to find the files. I can make these changes and push an additional commit tomorrow when I have time.