Extract Element Management to DFlexDOMManager #2755

Job	Run time
Lint	51s
Check Types	57s
Unit Test	57s
One Container Vertically - Chrome	4m 16s
Multiple Containers - Chrome	3m 4s
e2e-linux (18.15, chromium, production)	2m 38s
e2e-linux (18.15, firefox, production)	3m 15s
e2e-mac (18.15, chromium, production)	6m 59s
e2e-mac (18.15, chromium, development)	11m 49s
e2e-mac (18.15, firefox, production)	5m 19s
e2e-mac (18.15, firefox, development)	8m 16s
e2e-mac (18.15, webkit, production)	3m 21s
e2e-mac (18.15, webkit, development)	11m 29s
e2e-windows (18.15, chromium, production)	5m 0s
e2e-windows (18.15, firefox, production)	9m 6s
Publish to NPM	0s
	1h 17m 17s

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