Make paramSetXXX() functions non-blocking #1235
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Fixes #1234
This PR changes the 'paramSetXXX()' functions to be non-blocking when pushing data to the TX queue. If the queue is full, a warning message will be logged.
The behavior should be identical in most (all?) cases when a client is connected. The TX queue is 120 slots long and it should not be full as long as a client is connected.
When no client is connected, an app can still call paramSetXXX() without surprises.