Support different input types to block handlers, validate manifest and mapping functions#516

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fordN wants to merge 3 commits intomainfrom ford/update-blockhandler-input-data

+154

Commits on Jul 15, 2020

manifest-schema,src/subgraph: Add data to EthereumBlockhandler, validate
fordN
committed

Commits on Jul 16, 2020

manifest-schema,subgraph: Update blockHandler block struct selecting api
fordN
committed
tests: Include test of catching incompatible block handler functions
fordN
committed