Fixes auto-cpufreq --update for Arch based distros for non AUR installations

[rootCircle]

Details:

• Updated logic now checks if auto-cpufreq is installed via AUR or not (pacman -Q auto-cpufreq). If found, it recommends using the system package manager to refresh it.

• Removed the obsolete yay checking as yay is considered a Pacman wrapper. (Need confirmation from @cosmos1721 for intent)

Fixes:
Persistant Arch-based distribution with AUR support detected. Please refresh auto-cpufreq using your AUR helper. error, even when you haven't installed auto-cpufreq from AUR, on Arch Distro.

References:
Arch Wiki - AUR Helpers

[shadeyg56]

Yeah, yay should never have been used in the first place as a lot of Arch systems don't even use it, while pacman is available on all Arch systems

[cosmos1721]

• Removed the obsolete yay checking as yay is considered a Pacman wrapper.

pls do, can you also look up other configurations that are done for Arch?

[AdnanHodzic]

Great one @rootCircle! Because I was proposing the same to @cosmos1721 as part of of the comments in original PR. But idea was that we'd wait for a PR like this one coming from Arch user :)

[rootCircle]

pls do, can you also look up other configurations that are done for Arch?

@cosmos1721
I could find references of arch checking in auto-cpufreq/gui/objects.py, auto-cpufreq-installer and auto-cpufreq/core.py. But, all their usage were safe in my opinion.

For now, I will wait for next release to test the update on Arch and will report, if it breaks. Rest all looks good to me ig:-)
Although, I have tried triggering an update event(editing setup.py) and was successful in installing also, but i need more surety regarding the same.

[rootCircle]

Updated to v2.0.0, update seems to work fine on Arch based distros!

Congrats for the v2.x.x feat! 🎉