Update VE core submodule to master (98b5c53)

New changes:
d79270a Update context menu according to stricter rules
af6ec80 Ignore staging events in CE surface
43f7385 SpecialCharacterInspector: Don't have a hard-coded default message for the JSON blob
0081b13 Update OOjs UI to v0.1.0-pre (a7ce4d48d9)
8e08e9f build: Remove over-ride on jscs's disallowQuotedKeysInObjects and make pass
a1fb10c Followup ab2d4cbebf40: fix whitespace preservation in CommentInspector

Change-Id: I1615665437a4c481371cee7e643cddf281c6434a