Log Message:
devel/bacon: update to 2.21.0

v2.21.0 - 2024/09/14
With show_changes_count=true, you can see the number of file changes that \ 
occurred since last job start.

Major change: the on_change_strategy setting and a new default strategy

 - With on_change_strategy = "kill_then_restart", the current job is \ 
immediately killed and a new job restarted.
   This is the behavior that bacon had before this PR. It has the downside of \ 
never allowing any job to complete
   if you're always changing files and the job is just a little too long to \ 
finish between changes.
 - With on_change_strategy = "wait_then_restart" (which is the new \ 
default, so you can omit it), bacon waits
   for the job to finish before restarting it. This is probably much better when \ 
the jobs aren't instant and you
   want to continue changing files while it's computing.

The on_change_strategy can be defined in the global prefs, in the project \ 
settings, and even for a specific job.