Prevent auto-format in auto-save

[voiceroy]

Fixes #12809

Adds an option in the config file (format-on-auto-save) to configure the formatting on auto save. Setting it to true will format the files on auto save, false (which is the default value) will not format the files on auto save.

Auto saving won't auto format the files now.

[voiceroy]

:wa did not format all files on write if formatting is enabled.

[voiceroy]

:wa did not format all files on write if formatting is enabled.

Fixed

[the-mikedavis]

Let's remove the config option for now and have auto-save always prevent formatting. Setting the option to true would have a confusing effect - it effectively disables auto-save. Once we can auto-save with formatting we can add a config option but in the meantime it will only be confusing.