Bash seperates on whitespace, so the fish completion file
actually works for bash and zsh. So remove the concept of shells
entirley and just use the singular aur_sh.cache file.
If for some reason output without the repository data is needed, the
user could always just pipe it into awk like so
`yay -Pc | awk '{print $1}'`. Or perhaps a --quiet option could be added
where yay will strip the output itself.
The completion cache now updates when installing AUR packages. This is
done as a goroutine with no wait groups. This ensures the program will
never hang if there is a problem.
The completion is stil updated during -Pc but as long as an AUR package
has been installed recently it should not need to update.
The cache will now also wait 7 days instead of 2 before refreshing.
A refresh can be forced using -Pcc.
