Move logfile and custom config to standard locations

[alirezaalavi87]

Hi. having mechivbes_custom directory and a logfile in your base home directory really doesn't make sense.
It would be much better if we moved to standard XDG paths.
~/.config/mechvibes for custom config and soundpacks, and /var/log/mechvibes or ~/.cache/mechvibes for logs.

[NotLazy]

Planned for next release, just working out some kinks with migration.

[github-actions]

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