New occ commands for richdocuments

[mmattel]

WHAT Needs to be Documented?

References:
owncloud/richdocuments#400
owncloud/richdocuments#402

WHERE Does This Need To Be Documented (Link)?

1. occ app section changes
2. Text changes in enterprise/collaboration/collabora_secure_view.adoc

WHY Should This Change Be Made?

Completeness

(Optional) What Type Of Content Change Is This?

• New Content Addition
• Old Content Deprecation
• Existing Content Simplification
• Bug Fix to Existing Content

(Optional) Which Manual Does This Relate To?

• Admin Manual
• Developer Manual
• User Manual
• Android
• iOS
• Branded Clients
• Desktop Client
• Other

Backports to 10.7 or below ?

@EParzefall @janackermann

[phil-davis]

owncloud/richdocuments#401 release 2.6.0 is in progress. So this doc will be a bit ahead. But that should be fine - the release will happen "real soon now" (tm)

[AlexAndBear]

@phil-davis @mmattel
We are not quite sure if the customer will give green light to the feature. So I don't feel good have this merged yet, still waiting for feedback.

[mmattel]

@janackermann @jnweiger nobody told that there is a possible hon-hold issue... Just the other way round - will be part of the next release coming very soon 🤔