Remove auto upload behaviours

[mario]

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There are several issues with auto upload behaviours, some of which can and some of which aren't that EASILY fixable.

Because the new Auto Upload overwrites files on the server (https://github.com/nextcloud/android/issues/1685), users think this is unwanted behaviour. Unfortunately this is indeed INTENDED - if you modify a file, you should get a file uploaded. And CREATE + DELETE + CREATE == modification.

In general, I think we should not touch the files outside our Nc data folder so I would suggest we completely eliminate Auto Upload behaviours.