Update VE core submodule to master (3a80662)

New changes:
ffb8ef1 Use this.$ where available
b096a83 *Actual* death and/or *actual* destruction
8b122b3 Destroy old target before initialising new one in demo
49b4d9f Localisation updates from https://translatewiki.net.
ef6ff7d Localisation updates from https://translatewiki.net.
e220b3e Re-order special character mathematical symbols to be degrees, minutes, seconds
3a80662 Localisation updates from https://translatewiki.net.

Change-Id: Id4b5dcb000ad4e7fad55c0838701c312293b8fc8
Merge "Update VE core submodule to master (3a80662)"