Rebind Esc to "Leave Current Mode"

[asford]

This is an optional add-on to #69 that makes "Leave Current Mode" the default binding for Esc.

The leave-current-mode behavior of "Esc" could/should be made default for this plugin.
Though this is a shift in behavior for existing jupyterlab-vim users, it's less disruptive for existing jupyterlab users.

Please finish the following when submitting a pull request:

• Add a line to History.md briefly documenting the change.

If this is a release, additionally do the following:

• Update the dependencies in package.json
• Run jlpm install to update yarn.lock

Thanks!

[github-actions]

👈 Launch a binder notebook on branch asford/jupyterlab-vim/leave_current_mode_default

[asford]

I've uploaded a build to anaconda under jupterlab_vim=0.15.1+leave_current_mode,
as I wasn't able to get the binding demo functioning particularly well.

[krassowski]

We will need to resolve conflicts here and possibly some more discussion. @ianhi do you have an opinion on this one?

[ianhi]

I think this is a very nice idea! It would also go a long way towards helping out with #73

[ianhi]

@asford do you have time to resolve the merge conflicts - or would you prefer someone else resolve them and push?

[asford]

Please grab the conn on the merge.
I'm no longer able to drive this PR.

[ianhi]

Not sure why this got autoclosed - and I seem unable to re-open it. very confusing.

[firai]

I wonder if inability to re-open the PR has something to do with deforking. It seems like the branch in the PR was forked from jwkvam's repo.