Include variable to define what files to autosave and hide errors with mksession

[jordisantamaria]

The plugin is giving soo many errors all time, so I think It would be nice to let user decide what files want to autosave, to avoid those errors. Also mksession is giving error sometimes, for example in q: mode, so include silent to avoid show those errors, they are so annoying.

[thaerkh]

Thanks for the contribution! I think the whitelist is fine and we can merge that, though separately from the Git repo constraint which we can put in a separate PR as a feature flag.

Forcing Git as a dependency isn't ideal in all scenarios, but if we add an option to auto-setup sessions for root-dir git repos then I think that would be a great feature.

[jordisantamaria]

I see, thanks for feedback, my bad to request PR with master branch, I included git feature later lol. I will update It to give a flag for git repository then.

[jordisantamaria]

@thaerkh I updated It to include variable g:workspace_only_git_dir to activate workspace only for git repositorys. Is it ok like this?

[thaerkh]

This looks good to me, thank you!