Revert "Merge pull request #2742 from reeingal/backtester_ui"
Revert "Merge pull request #2742 from reeingal/backtester_ui"

This reverts commit a9a1fbcb8c568069aea2e8209ba88112871a1b66, reversing
changes made to 4ece3f4653925acdd50da7234be9b470b7aef8e6.

bigdig/vnpy,vnpy/vnpy,bigdig/vnpy,bigdig/vnpy,bigdig/vnpy,vnpy/vnpy