PlayRtttl

• Renamed PlayRttl.cpp to PlayRttl.hpp.
• Removed macros SUPPORT_RTX_EXTENSIONS and SUPPORT_RTX_FORMAT.

• Supporting direct tone output at pin 11 for ATmega328. Can be used with interrupt blocking libraries for NeoPixel etc.
• Use Print * instead of Stream *.
• Improved non-AVR compatibility.
• New Christmas songs example.

• Support all octaves below 8
• New styles '1' to '9' in addition to RTX styles 'C', 'N', 'S'

Since tone() is available on most architectures, PlayRtttl was ported to these.

• Natural is the new default style.
• New RTTTLMelodiesSmall sample array with less entries.
• Parameter now order independent.
• Modified oneMelody example.

• No Serial.print statements in this library anymore, to avoid problems with different Serial implementations.
• Function playRandomRtttlBlocking() + startPlayRandomRtttlFromArrayPGM() do not print name now. If needed, use new functions playRandomRtttlSampleBlockingAndPrintName() + startPlayRandomRtttlFromArrayPGMAndPrintName().
• Printing functions have parameter (..., Stream * aSerial) to print to any serial. Call it (..., &Serial) to use standard Serial;
• playRandomRtttlBlocking() renamed to playRandomRtttlSampleBlocking() and bug fixing.