Simplify BABE pre-digest definitions (#5289)

* Init vrf crate without type alias

* Generic PreDigest definition for BABE

* Fix BABE vrf interface change

* Missing default-features def in sp-consensus-babe

* Fix sp-consensus-babe compile

* frame-babe: fix type inference

* Unify type definitions of vrf output/proof and randomness

* frame-babe: fix tests

* Bump node impl version

* Update cargo lock

* Derive Copy for RawVRFOutput and RawVRFProof

* Fix duplicated derive

Co-authored-by: Gavin Wood <gavin@parity.io>

substrate/primitives/consensus/babe/Cargo.toml

@@ -12,9 +12,9 @@ repository = "https://github.com/paritytech/substrate/"
 sp-application-crypto = { version = "2.0.0-alpha.4", default-features = false, path = "../../application-crypto" }
 codec = { package = "parity-scale-codec", version = "1.2.0", default-features = false }
 sp-std = { version = "2.0.0-alpha.4", default-features = false, path = "../../std" }
-schnorrkel = { version = "0.9.1", features = ["preaudit_deprecated"], optional = true }
 sp-api = { version = "2.0.0-alpha.4", default-features = false, path = "../../api" }
 sp-consensus = { version = "0.8.0-alpha.4", optional = true, path = "../common" }
+sp-consensus-vrf = { version = "0.8.0-alpha.4", path = "../vrf", default-features = false }
 sp-inherents = { version = "2.0.0-alpha.4", default-features = false, path = "../../inherents" }
 sp-runtime = { version = "2.0.0-alpha.4", default-features = false, path = "../../runtime" }
 sp-timestamp = { version = "2.0.0-alpha.4", default-features = false, path = "../../timestamp" }
@@ -25,9 +25,9 @@ std = [
 	"sp-application-crypto/std",
 	"codec/std",
 	"sp-std/std",
-	"schnorrkel",
 	"sp-api/std",
 	"sp-consensus",
+	"sp-consensus-vrf/std",
 	"sp-inherents/std",
 	"sp-runtime/std",
 	"sp-timestamp/std",