Update VE core submodule to master (8686f85)

New changes:
84ac603 Use shorthand for collapsed ranges
542dc47 SVG fixes
8686f85 Move non-icon/indicator styles out of ve.ui.Icons.css

Change-Id: I4d524da912dec338b2fdaf3b58060e3d47292d9c
Merge "Update VE core submodule to master (8686f85)"