Bug: Mising Bat file. (error: Unable to find vcvarsall.bat)

I tried to build according to the instructions, but it seems that there is a file "vcvarsall.bat" that is missing. I'm not sure if this is needed or not.

Using Powershell on Windows 10.

```
\PyDaw> python setup.py build
```
```
running build
running build_py
creating build
creating build\lib.win-amd64-3.7
creating build\lib.win-amd64-3.7\daw
copying daw\dummy.py -> build\lib.win-amd64-3.7\daw
copying daw\exceptions.py -> build\lib.win-amd64-3.7\daw
copying daw\flstudio.py -> build\lib.win-amd64-3.7\daw
copying daw\lmms.py -> build\lib.win-amd64-3.7\daw
copying daw\__init__.py -> build\lib.win-amd64-3.7\daw
running build_ext
building 'flpmodule' extension
error: Unable to find vcvarsall.bat
PS \PyDaw>