* Update wasmi and pwasm-utils (#8493)
* Update wasmi to 0.2
New wasmi supports 32bit platforms and no longer requires a special feature to build for such platforms.
* Update pwasm-utils to 0.1.5
* Fetching logs by hash in blockchain database (#8463)
* Fetch logs by hash in blockchain database
* Fix tests
* Add unit test for branch block logs fetching
* Add docs that blocks must already be sorted
* Handle branch block cases properly
* typo: empty -> is_empty
* Remove return_empty_if_none by using a closure
* Use BTreeSet to avoid sorting again
* Move is_canon to BlockChain
* typo: pass value by reference
* Use loop and wrap inside blocks to simplify the code
Borrowed from https://github.com/paritytech/parity/pull/8463#discussion_r183453326
* typo: missed a comment
* Pass on storage keys tracing to handle the case when it is not modified (#8491)
* Pass on storage keys even if it is not modified
* typo: account and storage query
`to_pod_diff` builds both `touched_addresses` merge and storage keys merge.
* Fix tests
* Use state query directly because of suicided accounts
* Fix a RefCell borrow issue
* Add tests for unmodified storage trace
* Address grumbles
* typo: remove unwanted empty line
* ensure_cached compiles with the original signature
* Enable WebAssembly and Byzantium for Ellaism (#8520)
* Enable WebAssembly and Byzantium for Ellaism
* Fix indentation
* Remove empty lines
* Fix compilation.
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