win, build: add documentation support to vcbuild

Adds doc option to vcbuild.bat which will install node-doc-generator dependencies and build the documentation in the %config%\doc folder.

Adds lint-md-build option which will download markdown linter.

Adds lint-md option, included by default in lint and test options which will run linter on the markdown files in the doc folder.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines