Detect NeoForge ModDevGradle plugin (Implements #24)

[JulianVennen]

Implements #24

[Darkhax]

Unfortunately the net.neoforged.moddev plugin is also used in loaderless (common) environments so this would create a false positive. This would not be an issue in the majority of use cases but could still create confusion. This is why #24 was rejected as well. I think the correct approach would be to check if it has the plugin and does not have the neoFormVersion property, but there may also be a more reliable way to detect it.

[JulianVennen]

I had to add moddevgradle as a dependency to check if that property is set. Unfortunately, the "getNeoFormVersion" throws a slightly weird exception if it isn't set, and the underlying workflow dependency stuff is marked as internal, so the result is a little hacky.