Close #3184: Download Limit Support

[i2h3]

• Added tableDownloadLimit entity to app database.
• Extended capability query to also consider download limit app.
• Extended capabilities list view for display of download limit availability.
• Extended share detail user interface to mimic the web user interface for managing download limits.
• Every time WebDAV properties of a file are retrieved, its associated download limits are removed and recreated.

Housekeeping:

• Outsourced NCShareDateCell into dedicated source code file.
• Outsourced NCShareToggleCell into dedicated source code file.

Notes:

• In my first attempt I had a detail view in the download limit row of the advanced share options showing the remaining number of downloads. However, that required to inject and retain the download limit entity object into the complicated share table configuration object. That, in turn, results in inconsistent data state due to invalid and outdated references. To resolve those issues, the assembly of the advanced share options user interface needs some refactoring which appears to expansive at this point and I prefer to leave it as it is for now.

[i2h3]

This depends on the still pending merge request for required changes in NextcloudKit (nextcloud/NextcloudKit#107). Given that is integrated and released as a version, the dependency version specification in this merge request must be adjusted before merging.

[mpivchev]

I see some whitespace warnings, can you enable this if you haven't already?

[mpivchev]

Can you please add an On Off label on the right side of "Limit Downloads" ?

Example:

[i2h3]

I see some whitespace warnings, can you enable this if you haven't already?

@mpivchev I have enabled those already. That's one of the first things I always do when setting up Xcode. 😁 But for some reason Xcode really likes its white space lines… 🙄

Can you please add an On Off label on the right side of "Limit Downloads" ?

I first had an accessory view in the share view but I remember faintly it somehow spaghettified state management, so I left it out. I will have another look into it.

[i2h3]

@mpivchev Now I remember what the problem was. It worked only partially due to the complicated UITableView setup. I had an implementation where the initial state was presented but due to the static retention of NCShareConfig, how it is passed through and the metadata and how cells are constructed it appeared to me that I can only get this through with extended refactoring which I considered out of scope.