* Null-check packet allocations in allocForSending and its callers
Sibling of 0ae44d701.
* Null-check allocDataProtobuf, allocAckNak and allocErrorResponse callers
Second tier of the same nullable contract.
* Keep telemetry sleep scheduling on allocation failure
Allocation failure now marks the telemetry invalid instead of returning
early, so power-saving SENSOR nodes still arm deep sleep.
* Implementation of Status Message
* Change drawNodeInfo to drawFavoriteNode
* Truncate overflow on Favorite frame
* Set MAX_RECENT_STATUSMESSAGES to 5 to meet memory usage targets