Fix message handling in exec v1 mode [#3312]
Closes #3312 (closed). Ignores the message field of envelopes when running executor v1. Refactors the simulator to allow testing the ABCI from within the simulator.
Changelog: fix
Closes #3312 (closed). Ignores the message field of envelopes when running executor v1. Refactors the simulator to allow testing the ABCI from within the simulator.
Changelog: fix