Check for output capacity before reading serial i/o, and order clients by descending interactivity. #984
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Serial data was being read without considering output capacity, leading to data loss when output capacity was exhausted.
This checks for output capacity before performing the read.
As only one client may read per round, clients checked earlier will starve clients checked later for io.
Placing the clients with the lead expected load earliest should minimize disruption.
Closes #983