Enable context menus for mobile#698

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WoozyG wants to merge 13 commits intovaadin:masterfrom

WoozyG:ContextMenu

Commits on Feb 28, 2019

Remove mobile "Fill" overlay, implement context menu for all
WoozyG
committed

Commits on Mar 12, 2019

Commits on Mar 13, 2019

Commits on Mar 14, 2019

Fix double-adding of scroll position that caused mobile zoomed context
WoozyG
committed

Commits on Mar 26, 2019

Removed extra whitespace
Tulio Garcia
committed
Removed more extra whitespace
Tulio Garcia
committed

Commits on Apr 9, 2019

Updated screenshots
Tulio Garcia
committed

Commits on Apr 10, 2019

Updated more screenshots
Tulio Garcia
committed
Update unit tests to handle lack of contextClick in PhantomJS.
WoozyG
committed