fix(flex-stacker): standardize the gcode responses to use key and value pairs.

[vegano1]

Overview

While working on the flex stacker hardware controller, I noticed that some gcode responses have different formatting, some have key value responses, and others don't. So to make parsing consistent let's standardize the gcode responses to return key:value pairs which are easier to parse.

Changelog

• Change the gcode message responses to key:value pairs where needed

Testing

• Make sure that all the Gcodes still work and respond accordingly

[sfoster1]

Thanks!