Create onlyoffice extension

[LukasHirt]

Requires owncloud/web#4324 to work in ocis-web. Testing requires running oc10 server with the onlyoffice app installed and enabled + running onlyoffice docs server.

Some summary of my brain trips when creating this:

Originally I was considering creating a component which would contain an iframe loading the editor so we are not really leaving ocis-web. This had two problems though - we would need to set a new header to allow this and we would anyway see the topbar of oc10. That's why I decided to go the way of opening the editor in a new tab.

Regarding tests - I don't really see any value in tests here. We do not have any views, any big logic... If the handler is working should be tested in ocis-web on a more general level. Testing if window.open seems like a needless increase of CI time.

[LukasHirt]

Just realising now. I've actually added the extension as default into the config.json in ocis-phoenix which doesn't make sense because it won't work yet in pure ocis setup. Need to think about how do we want to deliver this in bridge setup.

[kulmann]

I discovered some files that are not needed, some files that need to be one folder level higher, some occurrences of ocis-onlyoffice and some code that can be deleted.

Also, please contact @C0rby on how to implement the version command here and how to add it to the boilr template, so that we have it in every new service.

Good to see this extension! Really nice progress.

[LukasHirt]

@kulmann I've addressed all your comments. Regarding the versions command, I would like to tackle that in separate PR to finally get this one merged.

[kulmann]

Fix the staticcheck, then it's good to go 🚀

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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