Co-Authored-By: thiolliere <[email protected]>

# Conflicts:
#	frame/identity/src/lib.rs

# Conflicts:
#	frame/identity/src/lib.rs

* Introduce storage_next allowing iteration.  (without childtries)

* Implement prefixed storage

* impl cache in client_storage_cache (needs test)

* switch overlay change to btreemap

* Revert "impl cache in client_storage_cache"

This reverts commit c91a4848.

the storage cache cannot be used this way

* Revert "Implement prefixed storage"

This reverts commit 49310881.

* Impl StoragePrefixedMap for all map storages

* remove comment

* Move all overlays to BTreeMap

* btreemap iteration improvment

* impl for child tries

* impl tests for childs

* fix

* remove cache comment

* Fix grumble

* Limit number of uncles that can be provided.

* Check length of uncles vector on inherent.

* Set fatal error to true for too many uncles.

* Take max uncles in create_inherent.

* transaction-pool-api: use primitives/std

* transaction-pool-api: make primitives default-features = false

* transaction-pool-api: make default feature std

* transaction-pool-api: remove redundant primitives dependency

* Initial prototype

* Work on test harness.

* Minor removal

* Add some tests

* Fix tests

* More tests

* Final tests

* General documentation

* Function-level docs.

* Function-level docs.

* Identity fields.

* Fix dependency

* Docs

* Spelling nits

* Address grumbles.