Update VisualEditor for cherry-picks

New changes:
f38267a Update VE core for cherry-picks (7819523)
    2a0f804 Restore original rowspan/colspan rather than normalizing or overwriting with NaN
    7819523 Initialize mobile context as visible

Change-Id: Ida6422cf03821b609cd47c5224a2c844b361a23e
Merge "Update VisualEditor for cherry-picks" into wmf/1.25wmf7