nodeos crash fix

Yet more builtins

Update launcher to reflect history plugin rename.

Replace eager memory usage checks with a deferred check at the end of the transaction

Fix for eos #2675 (!"unresolvable": env.__fixunsdfti)

- buy & sell ram using bancor algorithm
- ram is no longer delgated
- fixed warning with double secondary index
- add block_timestamp_type

Api tests

minor updates due to controller api changes;  provide methods via chain_plugin;  publish data via chain_plugin

Add code coverage pipeline for buildkite