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avoid empty http authorization header

make basic authorization really optional in http header.

typo

test case: http://mcrscast.mcr.iol.pt/cidadefm
metadata are in xml format ~ 1KB and bigger (the normal length is  ~ 200 bytes)
buffer enlarged (if PSRAM found), so streamtitle can only displayed if PSRAM is available, otherwise, metadata are ignored

https://hls-01-europaplus-top40.emgsound.ru/21/playlist.m3u8 Top40
https://hls-01-europaplus-new.emgsound.ru/27/playlist.m3u8   NEW
https://hls-01-europaplus-party.emgsound.ru/22/playlist.m3u8 PARTY
https://hls-01-europaplus-light.emgsound.ru/23/playlist.m3u8 LIGHT
https://hls-01-europaplus-urban.emgsound.ru/28/playlist.m3u8 URBAN
https://hls-01-fresh.emgsound.ru/9/playlist.m3u8             ??
https://hls-01-europaplus-acoustic.emgsound.ru/25/playlist.m3u8 ACOUSTIC
https://hls-01-europaplus-residance.emgsound.ru/26/playlist.m3u8 RESIDANCE

more m3u8 streams are working now
e.g. https://hls-01-regions.emgsound.ru/11_msk/playlist.m3u8

not working with Arduino Version 2.0.1 ... 2.0.4
V2.0.5 is okay

flag:
    -Wextra
    -Wall

correct wrong dma buffersize in playI2Sremains()

event audio_process_i2s for processing audio data extern after applyi…