Linux support

[edfloreshz]

This PR adds support for Linux by implementing the FreeDesktop standard color-scheme key.

In the event this key isn't present in the system, the crate will fallback to traditional ways of figuring out if dark mode is enabled.

This PR is ready to be merged.

Fixes #1

[edfloreshz]

The last commit implemented detect() for many distros, I would appreciate some help testing it.

[frewsxcv]

Is this pull request still in-progress?

[edfloreshz]

Been kinda busy but still in-process.

Converting to draft.

[Be-ing]

This should prefer the new Freedesktop standard and fall back to legacy desktop environment specific methods if that is not available.

[edfloreshz]

I will take a look at it.

[edfloreshz]

I added initial support for FreeDesktop's color-scheme key, I would appreciate some help testing this code as I don't currently have this key present in my system.

[edfloreshz]

This is ready to merge, already tested the new color-scheme implementation.

I will make the required changes to macOS and Windows to accommodate the Result we return from main now.

[edfloreshz]

This should be ready to merge now 🙂

[edfloreshz]

I got a 404 when I clicked the invitation 🤔

[frewsxcv]

@edfloreshz What happens if you go here? https://github.com/frewsxcv/rust-dark-light/invitations

[edfloreshz]

Got it! Thanks 🙏🏼

[edfloreshz]

Alright, all reviews have been resolved, I would suggest we test this thing out before we merge it @Be-ing

[Be-ing]

I would suggest we test this thing out before we merge it

How about I rebase and clean up the Git history tomorrow and open a new pull request before merging? I'll do some testing on all the supported desktop environments too.

[edfloreshz]

I would suggest we test this thing out before we merge it

How about I rebase and clean up the Git history tomorrow and open a new pull request before merging? I'll do some testing on all the supported desktop environments too.

Sounds good! Let me know if you notice something else.

[edfloreshz]

How about I rebase and clean up the Git history tomorrow and open a new pull request before merging? I'll do some testing on all the supported desktop environments too.

We can squash all the commits into one, edit the commit message and merge right from GitHub, we don't have to open another PR. @Be-ing

I have redacted the following commit message, let me know your thoughts.

* Linux support

This PR implements support for Linux/BSD by using the FreeDesktop Color Scheme Standard.
On supported systems this will be the preferred option, otherwise it will use 
traditional methods to determine the current state of the OS color scheme.

If that's the case, the following distributions have been implemented so far:

- KDE Plasma
- GNOME
- Mate
- Unity
- XFCE
- Cinnamon

The rest of the distros will fall back to light mode.

We will be implementing more of them in the future.

Changelog:
- Adopted FreeDesktop Color Scheme Standard using `zbus`.
- Marked dependencies as Linux/BSD only.
- Implemented `Mode` and created `from` function that takes a bool and returns either `Light` or `Dark`.
- Implemented `check_dconf` for GNOME based Desktop Environments. 
- Implemented `check_file` to read from configuration files for other distributions.

Co-authored-by:

- Corey Farwell <coreyf@rwell.org>
- Funami580 <Funami580@users.noreply.github.com>
- Be <be.0@gmx.com>

If you're okay with this commit message let me know after you're done testing so I can merge.

[Be-ing]

I did a bit more than squashing to one big commit, see #6.

[edfloreshz]

Closing because of #6