Use std min/max, prevent min/max macro (PR #14422)
Windows include files (minwindef.h) expose min and max macros.
These interfered with the type safe and standard std::min and std::max functions.
* Preventing the definition of min/max by supplying /DNOMINMAX during the build.
* Updated nvdaHelper readme to include this and other changes (updated c++ standard)
* Fixed code that relied on the min/max macros.
