`cargo wdk new --umdf` should generate `config.toml`

[wmmc88]

Right now, config.toml is not generated for UMDF drivers create via cargo wdk new --UMDF. UMDF drivers currently require static crt linking, so the new subcommand should generate a config.toml similar to the one generated for KMDF.

There should also to be a test to check for successful compilation with the templates. Since #423 is not addressed yet, the test would need to also do some light modification of the new package before building.