New arch/shares

[davigonz]

Implements #2486
It needs owncloud/android-library#244

---

QA

Test plan:

https://github.com/owncloud/QA/blob/master/Mobile/Android/Release_2.12.0/Sharing%20-%20regression.md

BUGS & IMPROVEMENTS:

• (1) Loading stuck when trying to create an already existing private share [FIXED]
• (2) Public shares appear even after being deleted in server [FIXED]
• (3) File thumbnail not visible New arch/shares #2487 (comment) [FIXED] 
• (4) Permissions not granted in reshares do not show correct error New arch/shares #2487 (comment) [FIXED]
• (5) Change of password enforcing does not work as expected New arch/shares #2487 (comment) [FIXED]
• (6) Error message after not increasing permissions New arch/shares #2487 (comment) [FIXED] 
• (7) Error message after switching permissions in folder public link creation/edition New arch/shares #2487 (comment) [FIXED]

[davigonz]

The code of this PR has been reviewed through several PRs, one for each feature. So, code approved, ready to test @jesmrec

[jesmrec]

(3) [FIXED]

Open Share view

On the top left, the file thumbnail is not visible if the file is not a pic

[jesmrec]

(4) [FIXED]

1. User1 shares with User2, revoking Edit permission and granting Share permission
2. User2 shares with User3 and try to grant Edit permission

Current: Error Not Found
Expected: Error that fits the scenario. Unfortunately, the error in 2.11.1 was not also the most appropriate (local copy could not be deleted)

NOTE: in specific folder permissions, also is reproducible.

[jesmrec]

(5) [FIXED]

1. Set the following capability set up:

• Enforce password protection for upload-only (File Drop) links -> Enabled
• Set default expiration date -> Enabled
• Expire after X days (set the vale you want)

2. Create a public link ver a folder with:

• Name: no matter
• Download/view permission
• No password (not enforced for this level of permission)
• Expiration: enforced and set, no changes needed

3. Edit the link, setting in the following way:

• Upload Only (file drop)
• Set a password, since now is enforced by capability

4. Save the edited link

Current: Bad request
Expected: Link saved

[jesmrec]

(6) [FIXED]

This one comes from (4). Repeat step 1. and in step 2. and then:

3. Grant user3 to share the item

Current: Error message from step 2. stays in screen
Expected: Error message removed

This one is only an aesthetic one, so no blocker and no must in case of trickiness.

[jesmrec]

(7) [FIXED]

1. Set the following capability set up:

• Enforce password protection for read-only links -> Enabled
• Enforce password protection for read&write links -> Disabled

2. Create a public link over a folder with Download/view permission
3. Save -> Error of enforced password is displayed
4. Switch the permission to Download / View / Upload

Current: Error "Password are enforced" is displayed
Expected: After switching the permission to a new allowed one, the error is vanished.

NOTE: same error in editing mode

[jesmrec]

Everything fixed, shares with new architecture done!! great job!