Contract are partitioned into query and execute functions. Query functions
read contract state; whereas, execute functions may mutate state. These groups
of functions are contained in distinct modules: src/execute/ and src/query/.
If the contract implements any other entrypoint, like reply, one can create a
new reply module following the established pattern.
TODO
This lets you change the "owner" address associated with the contract.
Return one or more specified properties from state.