Combine Activity View with Sync Protocol Information

[dragotin]

The three-tab activity (server activity, sync protocol, not synced) is not "intuitive" enough according to @jancborchardt in #1443. With the new activity API we can change that and combine the Activity Stream and the sync activity.

@jancborchardt please sketch that, considering the following details:

• The server activity stream can talk about far more files than the client has synced
• The server activity can be disabled completely or in parts
• The client view needs to combine multiple server activity streams into one
• How is the info about ignored files presented.
• How is the information about errored files presented
• How is the information about created conflict files presented Inform User about Conflict File creation #3222

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[guruz]

We were also wondering if the current uploads/downloads progress should appear in that list too.
Then the account tab could be solely used for the more static things like selective sync and quota.

[dragotin]

The API as described in owncloud/activity#405 turns out to be not suitable for what we wanna achieve in this issue, reasons are outlined in the owncloud/activity#405 . I suggest to remove the gold-ticket and move this one to backlog again.

We need to find more effective ways to synchronize the API needs between WebUI, mobile and desktop.