Update VE core submodule to master (ad18102)

New changes:
65042de Fix alien test data
83dccbe Add toolbar menu labels to each group for consistency
2e40ef9 Move 'language' tool from the insert to the styling menu, like in VE-MW
6fb21b2 Add toolbar action section to SA demo with keyboard shortcuts tool
f3eb000 ve.ui.Toolbar: Optimise onSurfaceViewKeyUp performance
eb4e9eb Make sure the document is focused when setting a selection
48584d3 Fixes to getRelativeOffset and getRelativeRange		
fcc427f [BREAKING CHANGE] Remove generatedContents argument from afterRender
825e4be Documentation fixes in test utils		
dbbbe0b Unit tests for showSelection		
1ba9234 Don't handle up/down on focusableNodes even if backwards
a667b87 Remove label from 'insert' menu, and instead use a large plus icon
88885b1 Localisation updates from https://translatewiki.net.		
1f3b79f Initialize data first		
18369b1 Add 'clone' and make 'getDimensionsFromValue' static in ve.dm.Scalable		
92e6b7b Switch to 'custom' when MediaSizeWidget updates		
d0cd87e Localisation updates from https://translatewiki.net.		
1ee21ff Remove lies from documentation		
164f07f Safely ignore requests to open unrecognized windows

Local changes:
Work on a cloned scalable when editing images

Make sure the image model handles a cloned copy of the node's
scalable object, which is then shared with the media size widget.

Bug: 67687
Change-Id: Ie3676b715f5bae3d83da03d667cef3a6a847e212
[BrowserTest] update switch-edit-mode test for new UI

Also add new checks for switch-modal Discard and
Cancel options

Change-Id: I228b0dee1d110f6a72be4966bbc5918f294ab717
Merge "Update VE core submodule to master (ad18102)"
Merge "[BrowserTest] update switch-edit-mode test for new UI"