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If there is metadata behind the audio block and it is a local file, it will now be read
new function 'seek_m4a_ilst()' // item list atom, contains the metadata

indata underflow in decodeNextElement()

make thread safe

for critical areas:
    xSemaphoreTake(mutex_audio, portMAX_DELAY);
    xSemaphoreGive(mutex_audio);

for areas that can be called by their own thread
    xSemaphoreTakeRecursive(mutex_audio, portMAX_DELAY);
    xSemaphoreGiveRecursive(mutex_audio);

AudioBuffer: if "no PSRAM" is requested, really avoid it

bugfix in setTimeOffset

prevent background task to get all CPU

This is a fix proposal to avoid that the high priority of the separate background task
will get almost all CPU and the sketch loop() function is not called.
This happens when no audio is running as the audio.loop will return fast and called again on high priority.
When there is playing audio the separate task gets suspended while waiting for network packages,