Merge branch 'correct-comp-linux' into 'master'

Correct comp linux

- Use CMake `CMAKE_CXX_STANDARD` to support C++11
- Check if `iMSTK_USE_OPENHAPTIC` is defined before using HDAPIDeviceClient in Sandbox
- Replace `itoa` (non standard) by `sprintf` in Sandbox
- Correct warnings in Sandbox

See merge request !90