im-online: use generic crypto (#3500)

* im-online: support using ed25519 and sr25519 crypto

* app-crypto: add trait bounds to RuntimePublic::Signature

* im-online: add missing type annotations

* authority-discovery: depend on im-online module and use its crypto

* node: set i'm online crypto to sr25519

* node: bump spec_version

* rpc: don't generate i'm online pubkey in insert_key method

* im-online: fix docs

* im-online: move app crypto packages

* aura: move app crypto packages

substrate/core/rpc/src/author/mod.rs

@@ -162,7 +162,7 @@ impl<B, E, P, RA> AuthorApi<ExHash<P>, BlockHash<P>> for Author<B, E, P, RA> whe
 			Some(public) => public.0,
 			None => {
 				let maybe_public = match key_type {
-					key_types::BABE | key_types::IM_ONLINE | key_types::SR25519 =>
+					key_types::BABE | key_types::SR25519 =>
 						sr25519::Pair::from_string(&suri, maybe_password)
 							.map(|pair| pair.public().to_raw_vec()),
 					key_types::GRANDPA | key_types::ED25519 =>