This change allows the user to choose the strategy for publishing
klipper states to MQTT. The original strategy where all state
updates are published to a common topic is still the default, but
can be turned off using the "publish_combined_status" config option.
The newly added strategy is publishing individual state updates to
separate mqtt topics. It is disabled by default, and can be enabled
with the "publish_split_status" config option.
Signed-off-by: Matt White <m.w.white@gmail.com>
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