Unique id for assertions

Łukasz Bujakrequested to merge
unique-id-assertion into develop

This MR adds printing of unique id for each FC_ASSERTION in protocol library, for the purpose of e.g. easy & reliable identification of error in testing frameworks.
The ids are generated using fc::city_hash64 fed with stringified assertion expression.
Verification of uniqueness of protocol's assertion expressions was added too.
Corresponding MR in wax - wax!311 (merged)

Edited by Łukasz Bujak

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