Enable Analyze in WT from Girder

[Xarthisius]

Allow to seamlessly create a Tale straight from Girder UI, taking current 'folder' content as a 'dataSet'.

Changes:

• repurpose 'Create Instance' for calling back to dashboard with the current folder as dataSet base
• update /folder/:id/dataset to just list items and folders, instead of recursively grabbing all the items
• drop unused menu items from Folder context menu

How to test?

1. Depends on https://github.com/whole-tale/ngx-dashboard/pull/323
2. Create a folder in girder. Populate it with data (one item, one folder at least).
3. Click on "play" button in the navbar.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 :warning:

Comparison is base (3d91197) 92.83% compared to head (e32780d) 92.82%.

:exclamation: Current head e32780d differs from pull request most recent head 10822b5. Consider uploading reports for the commit 10822b5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## stack_update_fix #570 +/- ## ==================================================== - Coverage 92.83% 92.82% -0.01% ==================================================== Files 61 61 Lines 4897 4893 -4 ==================================================== - Hits 4546 4542 -4 Misses 351 351 ``` | [Impacted Files](https://codecov.io/gh/whole-tale/girder_wholetale/pull/570?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=whole-tale) | Coverage Δ | | |---|---|---| | [server/\_\_init\_\_.py](https://codecov.io/gh/whole-tale/girder_wholetale/pull/570?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=whole-tale#diff-c2VydmVyL19faW5pdF9fLnB5) | `90.90% <100.00%> (-0.10%)` | :arrow_down: | | [server/models/instance.py](https://codecov.io/gh/whole-tale/girder_wholetale/pull/570?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=whole-tale#diff-c2VydmVyL21vZGVscy9pbnN0YW5jZS5weQ==) | `86.48% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=whole-tale). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=whole-tale)

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