Rewrite toggle-prevent-cleanup
Bind toggle-prevent-cleanup in editing-map
Move cleanup-buffer code
Don't show tags in Magit refs buffer

This is slow for repos that contain lots of tags.
Update magit-log-all-branches for upstream changes

Magit has removed magit-log-dwim [1] and changed the arguments to
magit-log-read-args [2].

[1] e0979bb6bd22a9ce5009a7cdf458034e52817da3
[2] 5737de048843bbad83f16ea13f57d69cdbe6971e