Rename: primitives/sr-std -> primitives/sp-std (#4327)

* primitives/sr-std -> primitives/std

* fix

* fix conflict

* rstd -> sp-std

* git mv

* fix review

* fix merge

substrate/frame/support/src/storage/generator/double_map.rs

@@ -14,8 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
-use rstd::prelude::*;
-use rstd::borrow::Borrow;
+use sp_std::prelude::*;
+use sp_std::borrow::Borrow;
 use codec::{Ref, FullCodec, FullEncode, Encode, EncodeLike, EncodeAppend};
 use crate::{storage::{self, unhashed}, hash::{StorageHasher, Twox128}, traits::Len};
 

substrate/frame/support/src/storage/generator/linked_map.rs

@@ -16,7 +16,7 @@
 
 use codec::{FullCodec, Encode, Decode, EncodeLike, Ref};
 use crate::{storage::{self, unhashed}, hash::{StorageHasher, Twox128}, traits::Len};
-use rstd::{prelude::*, marker::PhantomData};
+use sp_std::{prelude::*, marker::PhantomData};
 
 /// Generator for `StorageLinkedMap` used by `decl_storage`.
 ///

substrate/frame/support/src/storage/generator/map.rs

@@ -15,8 +15,8 @@
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
 #[cfg(not(feature = "std"))]
-use rstd::prelude::*;
-use rstd::borrow::Borrow;
+use sp_std::prelude::*;
+use sp_std::borrow::Borrow;
 use codec::{FullCodec, FullEncode, Encode, EncodeLike, Ref, EncodeAppend};
 use crate::{storage::{self, unhashed}, hash::{StorageHasher, Twox128}, traits::Len};
 

substrate/frame/support/src/storage/generator/value.rs

@@ -15,7 +15,7 @@
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
 #[cfg(not(feature = "std"))]
-use rstd::prelude::*;
+use sp_std::prelude::*;
 use codec::{FullCodec, Encode, EncodeAppend, EncodeLike, Decode};
 use crate::{storage::{self, unhashed}, hash::{Twox128, StorageHasher}, traits::Len};