Change .MakeMKV from filesystem to persist

[nalsai]

Moves the internal settings to the proper path (~/.var/app/com.makemkv.MakeMKV/.MakeMKV) as MakeMKV does not follow the XDG Base Directory specification.

This addresses the second point of #32 as best as possible without being able to change the MakeMKV source code

[flathubbot]

Started test build 172335

[flathubbot]

Build 172335 successful
To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/155453/com.makemkv.MakeMKV.flatpakref

[michaelkuhn]

Will users have to move their existing configuration manually in this case? I think that would be a bad user experience.

[nalsai]

Yes, they would have to move their configuration or set it again.

Considering that there is barely any configuration I think it wouldn't be too much of an issue.
99% percent of users are not going to change anything more than the product key (if you use the beta key you have to update it every couple of months anyway) and maybe lower the minimum title length if you want to also copy tracks shorter than two minutes.