Update VE core submodule to master (260d6c5)

New changes:
eb95f82 Store intended table selection before expansion and use when translating
392d1e6 Add table selection support to clear annotation tool
2529985 Refactor and fix table cell editing code
de1117c Support editing of caption nodes
f831ee7 Table caption tool

Change-Id: I8ddfe6349723bb20d9b530e954f745d1757bfbc1
Merge "Update VE core submodule to master (260d6c5)"