Update VE core submodule to master (a96cb00)

New changes:
c66e7a8 Update oo#compare usages
bbff57b Followup 8c71904: use getter for availableTools
f9587e8 Add myself to AUTHORS.txt
ffc9358 Localisation updates from https://translatewiki.net.
1025f3b Fix JS error in ce.LanguageAnnotation when dir is set but lang isn't
4ad483f Check IME simulations actually fail as expected
aaa991a Followup bbff57b, 8c71904: use getter for availableTools, again

Change-Id: I5bfa1201f38f2b86234535ed97a1c394d9cf8e58