v1.5.0 - add profiling; add coroutine names

• 1.5.0 (2022-03-19)
  • (Re)add support for human-readable coroutine names.
    • See Coroutine Names in the
      USER_GUIDE.md.
    • Adds the following methods to the Coroutine class: setName(),
      setName(), getCName(), getFName(), getNameType(), and
      printNameTo().
    • Resource consumption
      • Increases flash usage by 6-10 bytes per coroutine.
      • Increases static ram usage by 3 bytes (AVR) or 4 bytes (32-bit)
        per coroutine, plus the additional storage for the string itself.
  • Support profiling of Coroutine::runCoroutine() execution time.
    • See Coroutine Profiling in the
      USER_GUIDE.md.
    • API changes
      • Add CoroutineProfiler interface with a updateElapsedMicros()
        method.
      • Add Coroutine::setProfiler() to store the profiler pointer.
      • Add Coroutine::runCoroutineWithProfiler() which measures the
        elapsed time of runCoroutine() and calls
        CoroutineProfiler::updateElapsedMicros().
      • Add CoroutineScheduler::runCoroutineWithProfiler() which calls
        Coroutine::runCoroutineWithProfiler() instead of the normal
        Coroutine::runCoroutine().
      • Add CoroutineScheduler::loopWithProfiler() public static method
        which calls runCoroutineWithProfiler().
    • Provide LogBinProfiler subclass of CoroutineProfiler.
      • Keeps a frequency count of the elapsed microseconds using 32 bins
        representing the log2() function of the elapsed microseconds.
    • Provide 2 renderers of LogBinProfiler:
      • LogBinTableRenderer::printTo() prints a formatted table of the
        frequency count over all coroutines. This represents a poor-man's
        version of the log-log graph of the frequency count.
      • LogBinJsonRenderer::printTo() prints the frequency count
        in JSON format.
    • See HelloCoroutineWithProfiler
      and HelloSchedulerWithProfiler.
    • Thanks to peufeu2@ who provided the ideas and proof of concept in
      Discussion#50.
  • Coroutine consumes more static RAM
    • due to extra pointers to support setName() and setProfiler()
    • 8-bits: increases from 11 bytes to 16 bytes per coroutine
    • 32-bits: increases from 20 bytes to 28 bytes per coroutine
  • Move Coroutine::sStatusStrings to PROGMEM
    • Saves 12 bytes of static RAM on AVR and 24 bytes on ESP8266, if
      CoroutineScheduler::list() is used.