Application does not allow custom input and reward addresses to be provided

[olivierdelree]

Currently, the only options are serial ports that were automatically detected.
In the case of debugging/developing on something else than a Raspberry Pi, serial ports might not be available (or might be available but behind special permissions). Allowing the user to provide custom addresses (e.g., a pts) for use by the application would make it easier to run visiomode outside of "perfect conditions".