Implement a cache for debug logs (#596101).
Implement a cache for debug logs (#596101).

The cache is useful when a CM disappears and we don't want to lose its
debug output.

GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets