Fixed lua dofile on Windows
Fixed #909
Previously, on all platforms except windows, ScriptController modified the lua functions "dofile" and "loadfile" so that they will search in the directory FileSystem::getResourcePath(). I removed #ifndef WIN32 so that Windows will behave like this too.
Fixes a typo in ImageControl's UV calculations.
Allows opacity to affect ImageControls.
Merge branch 'next' of https://github.com/blackberry/GamePlay into bugfix