FR: Customizable commit messages

[qwinters]

For those of us that use semantic commit to generate changelogs / keep track of things, it's often helpful to have template-able commits for sync operations

Minimal viable version can be achieved by just allowing people to include a prefix for the current commit message (e.g. chore: Auto commit...)

I don't have a lot of bandwidth atm, but can take this on in the semi-near future and PR

[michal-h21]

@qwinters That's a good idea! And it was easy to implement, so it is now possible to use:

  let g:vimwiki_sync_commit_message = 'Auto commit + push. %c'

The whole string is passed to the strftime function, so you can use any date and time format you want.