Support function defs as function values (for factory dependencies)

[mikedmcfarland]

It would be nice if function defs were automatically converted to function values.

So that with the following class:

class PlatformsPage(store:PlatformStore,platformBackend:(BackendScope[Props,State] => Backend))

You could wire its dependencies with a module like:

trait PlatformsModule {
  lazy val platformsPage = wire[PlatformsPage]
  lazy val platformsStore = wire[PlatformStore]
  def platformsBackend(scope:BackendScope[Props,State]):Backend = new Backend(scope)
}

There are easy alternatives:

lazy val platformsBackend:BackendScope[Props,State] => Backend = new Backend(_)

type BackendFactory = BackendScope[Props,State] => Backend
lazy val platformsBackend:BackendFactory = new Backend(_)

But given that defs are used with MacWire, it seems like it would be nice to support function defs as function value dependencies.