Binding of IBM Cplex dynamic/shared library, modified based on rplex.

1. install cplex on your computer.
2. copy ..somepath\IBM\ILOG\CPLEX_Studio_XXXX\cplex\bin\x64_win64\cplexXXXX.dll file (or .so in linux os) into your crate root folder (or its subfolder).

cargo run --example qcp