Update VE core submodule for cherry-picks to make math inspector work
Use new dm.Surface method for checking undo history state
(hasPastState -> hasBeenModified).
New changes:
38776df [BREAKING CHANGE] Refactor history state methods to better suit uses
0c5238c Add system to dm.Surface for staging changes
8f0077c Only hide popups on selection change
rGVED1ff6c8dc3c56 Create ve#contains
rGVED92be9e2e9318 Prevent pasteTarget selection while already selected
rGVEDb3e575965459 Make ve.dm.Surface#breakpoint not crash
Change-Id: I5437e837f0b66a3094a7c1c43c91fcdd17b10783