Update VisualEditor (and VisualEditor core) for cherry-picks

VE core new changes (7b70172, Ia191d6e):
dbe6a62 Fix clipboardData API path on copy
20084c4 Fix broken node change detection

VE-MW new changes (b1a827e, Ib699f8d):
b1a827e Only validate required template params after blur

Change-Id: Idccf9cba1a0d24352cfa3d5b4a742f4a352eb534