GitLab

https://stream.nightride.fm/darksynth.ogg 
https://stream.chillsynth.fm/chillsynth.ogg 
https://stream.nightride.fm/ebsm.ogg

two measures:
- corrected a bit in mp3 syncword
- revent the high pass filter from clogging if samplerate is too low

Provide audio_id3lyrics() callback

correct buffer filltime in processWebFile()

strlwr() is not standard C function
avoid indexer error

````c++
if(InBuff.bufferFilled()){
    if(!readID3V1Tag()){
        int bytesDecoded = sendBytes(InBuff.getReadPtr(), InBuff.bufferFilled());
        if(m_f_playing){
            if(bytesDecoded > 2){InBuff.bytesWasRead(bytesDecoded); return;}
        }
        AUDIO_INFO("audio file is corrupt --> send EOF"); // no return, fall through
    }
}
````

if we send something to audio_info(), we must first check whether audio_info() even exists

set xSemaphoreTakeRecursive

In order to prevent an upward or downward overflow when amplified by the digital filter, a level reduction is required in this case. For example, if the filters increase by 3dB, the overall level must be reduced by that amount.
m_corr =  pow10f((float)db/20);
0dB  ->  1
1dB  ->  1.12
2dB  -> 1.25
...
6dB  ->  2