Add collapse/expand all functionality to org chart

Jean du Plessisrequested to merge
org_chart_collapse_expand_all into master

Why is this change being made?

Adds functionality to collapse/expand all nodes in the org chart.

Default state Screen_Shot_2020-03-10_at_16.39.53

Collapsed state Screen_Shot_2020-03-10_at_16.40.03

Closes #5298 (closed)

Edited by Jean du Plessis

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