[REQUEST] Move logging out of $XDG_CONFIG_HOME

[bloxx12]

btop logs to $XDG_CONFIG_HOME/btop/btop.log. This does not follow the XDG Base Directory Specification and is generally unexpected behavior.

Is your feature request related to a problem? Please describe.
I for example, set btop's $XDG_CONFIG_HOME to a location which is not writable, which it complains about every time I start it:

Describe the solution you'd like
This could, for example, be moved to $XDG_STATE_HOME or $XDG_CACHE_HOME:

The $XDG_STATE_HOME contains state data that should persist between (application) restarts, but that is not important or portable enough to the user that it should be stored in $XDG_DATA_HOME. It may contain:

• actions history (logs, history, recently used files, …)
• current state of the application that can be reused on a restart (view, layout, open files, undo history, …)

$XDG_CACHE_HOME defines the base directory relative to which user-specific non-essential data files should be stored.

This woud be much more intuitive, since $XDG_CONFIG_HOME is not meant for logging in the first place.