renamed duel play view and viewmodel
Revert "renamed duel play view and viewmodel"

This reverts commit dbc3f5b29f354ecb744acb082e9cefb60c5f0fe7.
Merge branch 'master' of https://github.com/MadCowDevelopment/PowersOfTwo
fixed message displayed when game is over
added animation for Overlay
fixed visibility problem of overlay