bootstrap-select edit_mode

Summary

caosdb/customers/leibniz-zmt/management#80

• Use the nice bootstrap-select instead of plain html selects for all selects in the edit_mode.
• Update bootstrap-select library to 1.14.0-beta3
• cache query results in edit_mode for the values of the reference dropdowns.

Focus

The task here was: Find all selects and add the "selectpicker" class. Then find all the lines in the code where the select are being inserted into the dom tree and initialize the selects (otherwise, the class won't have any effect). So please try and find more select or places where the initialization is missing.

Test Environment

Please do a manual test because the styling is not testable with unit tests.

You can use misc/map_test_data.py to insert some entities. Then open the edit mode

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