adds better warnings/errors; finishes refactoring handling methods into processor
adds better warnings/errors; finishes refactoring handling methods into processor

Opentrons/labware,OpenTrons/opentrons_sdk,OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons-api,OpenTrons/opentrons-api