Adding windows CI on appveyor

[simogasp]

• using boost from appveyor system (1.66)
  • unable to use boost from vcpkg at this time as it sports boost 1.67 which apparently does not work well with any recent nvcc version
    • Fixed by 8d6769f : there was a cuda file that was actually a cpp file
    • it does use boost by vcpkg
• not using Devil because the default build does not install the header <devil_cpp_wrapper.hpp> which is required for the applications
  • instead it uses the pgmread lib
  • incidentally, made Devil optional on cmake as the fallback on pgmread was already in place
• using cuda 9.1
• minor code fix in main.cpp and match.cpp, a range loop and a simplified code to add a path to a vector of string without passing by c_str conversion