* Implement a non generic version of child delta trie
* Use delta_trie_root in state_machine
* Expand InMemory backend to support multi-storage
* Create Consolidate trait
* Fix all crate compile and remove unused OverlayedChanges::drain
* Implement child storage root support and overlay changes
* Add child storage reader
* Add child storage writer
* Implement child storage cleaning
* Fix light backend compile
* Add all required ext functions for wasm executor
* Add ext def to io
* Add all io functions
* Fix nostd compile
* Add simple test
* Remove unnecessary vec copy in child_storage_root_transaction
* Use values_mut/for_each to make it shorter
* Use extend to shorter a for loop
* Move record_all_keys to trie so it's easier to generic them later
* space -> tab
* Remove to_owned in debug format
* Clean out all to_owned
* Break debug_trace to multiple lines
* Remove 0..
* UserError copy/paste typo
* Replace Vec::from_raw_parts by slice::from_raw_parts
* Use iter::empty()
* Wrap some long lines
* Wrap a missing line
* Remove unnecessary map
https://github.com/paritytech/substrate/pull/856#discussion_r226222663
* Call ext_free after from_raw_parts
* Fix tests in other crates
* Remove unneeded script
* Rename Substrate Demo -> Substrate
* Rename demo -> node
* Build wasm from last rename.
* Merge ed25519 into substrate-primitives
* Minor tweak
* Rename substrate -> core
* Move substrate-runtime-support to core/runtime/support
* Rename/move substrate-runtime-version
* Move codec up a level
* Rename substrate-codec -> parity-codec
* Move environmental up a level
* Move pwasm-* up to top, ready for removal
* Remove requirement of s-r-support from s-r-primitives
* Move core/runtime/primitives into core/runtime-primitives
* Remove s-r-support dep from s-r-version
* Remove dep of s-r-support from bft
* Remove dep of s-r-support from node/consensus
* Sever all other core deps from s-r-support
* Forgot the no_std directive
* Rename non-SRML modules to sr-* to avoid match clashes
* Move runtime/* to srml/*
* Rename substrate-runtime-* -> srml-*
* Move srml to top-level
Wei Tang