Number of small fixes and improvements

UI
- added "About" dialog to "Tools" button (in package dialog)

Fixes for VS2013 compilation
- nvtt/nvcore/DefsVcWin32.h - va_copy define there caused "macro redefinition" warning
- common.project - added _USING_V110_SDK71_ define to avoid similar warnings in other files
- UIProgressBar - avoid use of float to int converter which is missing in msvcrt

Tools:
- genmake now adds DEFINES for resource compiler (rc.exe) command line
- CompatTable - fixed layout of "filter" input