Rewrite module with better maintained SDK

Why isn't this fixed yet? This module is useless as it breaks the intergration after 1 hour.

I don't have an active project with Teamleader integration anymore, so currently no time to work on a fix.
If someone creates a MR and proposes a fix, I'd be happy to review & commit.

Still no update on this?

This should in no way be merged but attached patch works around this by manually refreshing the access token using the mode service.

I think this now ready for merge and release as a 4.x major release.

Can someone take some time to review ?

@j0sbeir
Thanks for the effort to update the module against the janhenkes library.
I have done some additional commits for cleanup and some issues I encountered while testing. Let me know if you don't agree with any of the changes, so we can discuss that further.

For now I will merge this into a new 4.0.x branch and create a first alpha release.

Thanks! phpcs was spitting out a small notice about the @mixin phpdoc in the newly added interface. Fixed it in my branch, but probably not worth a MR.

Automatically closed - issue fixed for 2 weeks with no activity.