redundant definition of queue size

[pnndra]

queue size of 0 has the same behaviour of queue size=1 hence it would make sense to move the -1 case (non blocking) to queue size = 0 and handle with queues everything else or, if we want to save a bit, move the current size=0 to size=1

https://github.com/bcmi-labs/Arduino_Threads/blob/01aca729e6480faf5f2571a182fee21b365207cf/src/Arduino_Threads.h#L72

[aentinger]

This issue is no longer relevant since the difference between blocking sinks with size 1, blocking sinks with size > 1 and non-blocking sinks is governed via the instantiation macros, i.e.
Blocking sink, size = 1

SINK(led, bool);

Blocking sink, size > 1

SINK(counter, int, 10);

Non blocking sink

SINK_NON_BLOCKING(counter, int);

Also see #49.