Rebased/develop/search web ui

This is the same as gh-2607 but rebased onto develop.

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This implements the new search UI in web. Changes in display of results (ordering, counts, pagination etc) will be in a future PR.

- Search form now resembles the mock-up in https://docs.google.com/document/d/1SzCSZH1IQOKiC_aBjPhe3bFWvzW06j1dlYFWPlyActQ/edit
- Search is now cross-group by default but can be a specified group and user
- By default we search on all types and fields, but these can be restricted.
- Searching with the field in the webclient top-right toolbar uses the defaults (All types, fields, groups).
- Wild-card searching should work. ? to replace 1 character and * to replace 1 or more E.g. ?etaphase or *phase.
- Date range should work.
- Form validation checks that text query is not empty and dates are valid (start before end etc).

Full testing of this PR is described on the updated search scenario: openmicroscopy/ome-internal#156