Open with ... NMRium

This looks like a very promising feature that should allow to open directly .nmrium file in a locally installed .nmrium instance.

https://chromestatus.com/feature/5721776357113856

@jwist If I understand well this would allow from 'R' to directly save a file as `.nmrium` and open it in the installed version of `NMRium`

@targos If once we have some time we could try origin trial for this feature: https://developer.chrome.com/origintrials/#/register_trial/-6682215947110973439