use XDG base directory spec for desktop builds if supported

[stewlab]

This change adds the usage of the XDG Base Directory Specification when referencing tulip.root_dir() from Tulip Desktop. This includes updating the Linux build script to use ~/.local/share instead of ~/Documents when referencing the desktop version of the root directory.

XDG Base Directory Specification
https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

Testing
I have tested this change in a Fedora 38 environment, and the output of tulip.root_dir() shows the new root directory in ~/.local/share/tulipcc as expected.

I also built this from source and flashed to my Tulip CC device, and did not find any problems with functionality. The output of tulip.root_dir() there was /.

macOS
I have not tested this for macOS. However, I noticed that version references ~/Documents as well, so I provided fall back to that directory if ~/.local/share does not exist. It seems that ~/Library would be a better option instead of ~/Documents, so it may be a good idea to update that as well later.

[bwhitman]

Thanks for this! I'll test it on macOS a bit and also ubuntu, debian and arch and WSL

[bwhitman]

Tests

• macOS
• Debian 12 (ARM64)
• Ubuntu 22.04 (ARM64)
• WSL
• Arch (I'm not capable of testing arch)

I have to merge in a commit about macOS app copying these for devs

[bwhitman]

OK, this all works. I'll merge in the macOS fix and the doc fix next. Thank you for doing this!!!!