* core/state: minor optimization in state onleaf allocation
* trie: implement dedicated committer and hasher
* trie: use dedicated committer/hasher
* trie: linter nitpicks
* core/state, trie: avoid unnecessary storage trie load+commit
* trie: review feedback, mainly docs + minor changes
* trie: start deprecating old hasher
* trie: fix misspell+lint
* trie: deprecate hasher.go, make proof framework use new hasher
* trie: rename pure_committer/hasher to committer/hasher
* trie, core/state: fix review concerns
* trie: more review concerns
* trie: make commit collapse into hashnode, don't touch dirtyness
* trie: goimports fixes
* trie: remove panics