feat: Add XDG Base Directory Specification support

[scheatkode]

This enables XDG support as well as a few other places in which the configuration file can be located. These are as follows :

• ${XDG_CONFIG_HOME} — if available, falling back to ~/.config otherwise.
• ~/Library/Preferences/chromaterm/chromaterm in MacOS.
• The default ~/.chromaterm.yml
• A system-wide /etc/chromaterm/chromaterm.yml

The file extensions can now also be yml as well as yaml.

Forgive my rusty python and feel free to point me towards any change that you might want incorporated.

[hSaria]

Thanks for the PR. I'll give it a look.

Don't worry about the tests :)

[hSaria]

Looks great and makes sense.

There's a bug with check_config_files and how it works with ct --config some_file.yml; it will ignore the --config value if it matches a file in any of the search paths. I'll get it sorted.

I'll update README.md to indicate the search paths.

Thanks again.

[scheatkode]

You're most definitely right, I forgot to check for args.config before calling the function, my bad. 😅
I have the fix ready, should I open another PR ?

Thank your for your feedback and for your work !

[hSaria]

I pulled the fix. Thanks again!

[hSaria]

I've opted to remove the macOS-specific path. Don't get me wrong, I'm a huge apple fanboy and a mac-user-first (can't wait for WWDC21 in a few days), but I wanna keep ChromaTerm as neutral as possible.

Although .yml and .yaml are both supported, I didn't mention them in README.md; I figured that might be confusing for people only just getting started.

Greatly appreciate your work 👍. v0.7.2 just released.

[scheatkode]

I've opted to remove the macOS-specific path. Don't get me wrong, I'm a huge apple fanboy and a mac-user-first (can't wait for WWDC21 in a few days), but I wanna keep ChromaTerm as neutral as possible.

That's indeed legitimate.

Although .yml and .yaml are both supported, I didn't mention them in README.md; I figured that might be confusing for people only just getting started.

Well thought. My experience is that software usually supports both implicitly.

Greatly appreciate your work 👍. v0.7.2 just released.

I just checked your commits and I have to say you did great ! Keep it up ! 👍