This is meant to replace the relay eventually, but for now it's a new
option, like BT or SMS, to be chosen. Protocol is handled in common/
code for the first time, meaning that linux and android interact without
the need to keep two platforms in sync. Linux uses lib-mosquitto, and
Android uses eclipse's Paho client (the generic java version, not the
one that uses four-year-old Service patterns and so crashes for SDK >=
26.)
I'm keeping it AND asserting at every possible location that the env
passed all the way in is the same as what the mapping produces. If in
months I haven't seen a single crash then I can evaluate which way of
passing the env around is better. (It'd be code size vs. performance,
as the passing of env is noticably faster. Code size could be fixed by
turning 'XWEnv xwe,' into a macro that goes away on some builds.)