Update fixed-hash & uint utilities (#1078)

* [core/primitives] Update crunchy 0.1 => 0.2

* [core/primitives] Update fixed-hash 0.2 => 0.3.0-beta

* [core/primitives] Update `uint` 0.4 => 0.5.0-beta

* [core/state-machine] Fix errors emerged by fixed-hash update

* [core/state-db] Fix errors that emerged from fixed-hash update

* [core/sr-io] Fix errors that emerged from the fixed-hash update

* [core/trie] Fix errors emerged from fixed-hash updates

* [core/trie] Make use of new Hash::as_fixed_bytes_mut method in tests

* [core/sr-primitives] Fix errors emerged from updating fixed-hash

* [core/executor] Fix errors that emerged from fixed-hash update

* [core/test-runtime] Fix errors that emerged from updating fixed-hash

* [core/test-runtime] Fix an error that emerged from fixed-hash update

* [core/transaction-pool] Fix errors that emerged from updating fixed-hash

* Add From<u64> impl for hash types defined in core/primitives

* [core/client/db] Fix errors that emerged from fixed-hash update

* [core/{client/network/rpc}]: Fix errors emerged by fixed-hash update

* [node/{cli/executor/runtime}]: Fix errors emerged by updating fixed-hash

* [core/network]: Fix bug in parsing constant str

* Update Cargo.lock

- Add crunchy 0.2.1
- fixed-hash 0.2.2 => 0.3.0-beta.3
- Add static-assertions 0.2.5
- uint 0.4.1 => 0.5.0-beta.1

* [core/primitives]: Add fixed-hash/rustc-hex feature for FromStr impl

* [core/primitives] No longer provide From<u64> impl for hash types if byteorder support is not enabled

* [core/primitives] Revert to using From impl again in primitives tests

* [core/..] Fix some bugs that emerged by recent fixed-hash updates

* Update a bunch of Cargo.lock files

* [core/state-db] Re-add whitespace between attr and extern crate/mod

* [core/primitives] Fix bug in From<u64> impl for hash types using the wrong feature guard

substrate/core/trie/src/lib.rs

@@ -428,7 +428,7 @@ mod tests {
 
 	#[test]
 	fn random_should_work() {
-		let mut seed = <Blake2Hasher as Hasher>::Out::new();
+		let mut seed = <Blake2Hasher as Hasher>::Out::zero();
 		for test_i in 0..10000 {
 			if test_i % 50 == 0 {
 				println!("{:?} of 10000 stress tests done", test_i);
@@ -439,7 +439,7 @@ mod tests {
 				journal_key: 0,
 				value_mode: ValueMode::Index,
 				count: 100,
-			}.make_with(&mut seed.0);
+			}.make_with(seed.as_fixed_bytes_mut());
 
 			let real = trie_root::<Blake2Hasher,_, _, _>(x.clone());
 			let mut memdb = MemoryDB::default();