Update VE core submodule to master (480b813)

New changes:
8a64317 Set XML encoding to utf-8 in SVGs
6bdacc7 Select highlights on touchend event
19409c6 Localisation updates from https://translatewiki.net.
2dca505 Split out ve.{dm,ce}.TextStyleAnnotation into parts, add other annotations

Change-Id: I42f82440919973dd040e3cb18ae0acba7d4a0c8d