Update VE core submodule to master (2d8aeef)

New changes:
24d7427 Handle empty rowspan/colspan attributes correctly
b8d17ba Delete src/ui/widgets/ve.ui.ContextWidget.js
0b9ad5b Tweak some ContextSelectWidget code after item→option update
c814765 Pass through excludeInsertions in get(Linear)Fragment
ebec520 Make debug bar controls narrower
b918adb Improve logging
4272ad3 Localisation updates from https://translatewiki.net.
166a52b [BREAKING CHANGE] Change command list from whitelist to blacklist
6a77571 Move getText from dm.Document to ElementLinearData
7084ae2 Emit ce.Surface#position after dm.Surface#documentUpdate
cb9eaf0 Localisation updates from https://translatewiki.net.
a014246 Refactor SurfaceObserver pollOnceInternal
d8ba262 Removing padding override from LanguageResultWidget

Change-Id: Iee383f21a1e7f2cd4506202947b6e1198251c48b
Merge "Update VE core submodule to master (2d8aeef)"