version 11.0 release

1. Use C++ std=c++17.

2. Change framework of ast, using visitor pattern.

3. New ast structure dump info format.

4. Change the way of module export, split library into different modules. Symbols begin with _ will not be exported.

5. Change stl to std.

6. Add REPL interpreter.

7. Improve structure of virtual machine, split global symbol stack(stores global symbols' values) and value stack(using in process).

8. Delete operand op_intg, add operand op_repl.

9. Add CMakeLists.txt for cmake user(including Visual Studio).

10. New ghost type register process.