Split up Admin page into groups

[blizzz]

We want to have the huge admin page split up in groups.

Goals:

• avoid to have a single huge, long page
• group different settings reasonable (e.g. everything related to sharing & federation)
• make sure specific settings have full pages (like Log, LDAP etc)
• avoid very small setting pages by another group "Additional settings"

Long term considerations:

• integrate personal settings

Solution:

• anything that has an admin settings page will register a Controller. A group¹ parameter is required.
• legacy support: group apps that do not register a controller into "Additional Settings"
• downside: we need to adjust as many apps as possible and provide developer documentation quickly

¹also requires a way to register groups. Probably another controller to register new groups and have "core" groups pre-defined (sharing, logging, background jobs, …)

@jancborchardt @nickvergessen

[jancborchardt]

Good summary. I only adjusted details (added federation, Logs and LDAP as specific examples).

And just for reference, the original oC issue is at owncloud/core#24188

[MariusBluem]

Maybe we could also integrate @icewind1991's logreader (https://github.com/icewind1991/logreader) as the default one into its own page. Now we would have space for it 😉 What do you think?

[blizzz]

@Mar1u5 this crossed my mind when I looked into the Logging section today. I would find it useful, however this would be out of scope of this issue (and the PR #796 is already huge).

[icewind1991]

Once #796 is done I'll adjust the logreader to register itself in the admin page, we can then look into shipping it on default

[MorrisJobke]

This is merged and backported to stable10