[Sharing Dialog] Simplify the user/group sharing permissions/attributes handling

[SamuAlfageme]

If in the future, more fine-grained options can be introduced in the sharing permissions/attributes via core-functionality or apps (ideally, announcing it via a corresponding capability). The permission handling on the desktop's native sharing dialog could be simplified to fit all these options while keeping it clean.

• Remove the "can" from "can share"/"edit" for a cleaner UI (like it happens with "change", "create" and "delete")
• Move all the extended permissions to a different "share settings" dialog, that can easily fit new check-boxes and additional options.

An initial proposal I came up with:

No extended permissions	No extra actions (ext.perm. nor "additional")

cc/ @ckamm @michaelstingl @pmaier1

[SergioBertolinSG]

The way the sharing api is done currently would require different dialogs for regular shares and public shares. In public shares you can add expiration date, a password and the option of public upload.

[SamuAlfageme]

@SergioBertolinSG we already have the different dialogs covered with the multitab "Share with ownCloud" (see above for "Users and Groups" and "Public Links" tabs).

This one is just about the Private share, in order to move the extended permissions or future new attributes for the share (e.g. expiration date) to a different dialog to both simplify and allow bulk edition of these. This is how it is right now:

[SergioBertolinSG]

Ah yes, didn't see it before.

Ok, adding that will require changes in the sharing api and some automated tests in core before adding it to the client.

[SamuAlfageme]

@SergioBertolinSG yeah, owncloud/core#11642 has to happen before the expiration date gets here, into the client.

[michaelstingl]

@SamuAlfageme @ckamm Expiration date for user/group shares planned for oC server 10.0.5: https://github.com/owncloud/enterprise/issues/2001#issuecomment-332617932

[TheOneRing]

The sharing dialog is considered deprecated