Implement a Flatpak packaging solution

[iWas-Coder]

Describe the feature

A new dist-flatpak target to the Makefile that packages the needed files to distribute to the public correctly. It needs to build the app and push it to the Flathub public repository. Further investigation is needed.

Why should it be implemented? (optional)

To be able to release the first alpha version of the software, the program needs to be distributable without the need of building from source.

Do you think there is any alternative? (optional)

Yes, we need to also target other packaging solutions, both package-manager-specific and universal formats.

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Additional context (optional)

N/A

Extra questions (optional)

• [x] I have used the search function to check if an issue already exists
• [x] I'd like to work on this issue

[iWas-Coder]

After some research, the AppImage packaging format is not suited for library distribution. Closing issue as not planned.