Feat/multiselect filter#232

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steveops wants to merge 5 commits intodevfrom

feat/multiselect-filter

Commits on Mar 24, 2020

Implement multi-select for dropdown filter
steveops
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Commits on Mar 26, 2020

Test filtering with dropdown with multiple selection
steveops
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Commits on Mar 29, 2020

Add ability to override multi-select theme
steveops
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Commits on Mar 30, 2020

Fix tests
steveops
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Commits on Apr 11, 2020

Separate data type from custom rendering
steveops
committed