Stream - new virtual method clear() to clear the receive buffer
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A very long time ago, in Arduino,
flush()changed from "purge input" to "send output buffer" and moved from Stream to Print.But now there is no method to "purge input" and there is demand as I see it on forums.
Arduino classes and methods are inspired by the Processing language. Processing has
Stream.clear().The goal of this PR is to establish the name
clearfor "purge input" functions in Stream implementations.For backward compatibility the method can not be added as pure virtual so some implementation has to be provided. An empty implementation would be confusing, so I took the
flush()implementation from Arduino 0023 Ethernet library's Client class.