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Optimize audio info, avoid strdup where easily possible

this saves about 1k binary size

if no audio_info() function is available, still lots of strings are
sprintf()'ed into buffers, just to be not used at all.
Check for existence of audio_info() before doing that.
For many cases, this is achieved with a simple macro. Ugly but
effective.

simplify http / https handling

this got (accidentally?) lost in the previous unrelated commit
31e32ccc

instead of duplicating code for both WiFiClient and WiFiClientSecure,
use one pointer that gets assigned the corresponding class.

 [-Wformat-overflow=] and [-Wmisleading-indentation]

Optimize AAC

ESP32-audioI2S-master/src/mp3_decoder/mp3_decoder.cpp:3653:28: error: suggest parentheses around '-' inside '<<' [-Werror=parentheses]

varoius speed optimizations, fix warnings, etc

+minor things

(more to follow ;)

+ fix warnings

since hostname can be greater than 256 byes, save lasthost in bigger charbuff
char m_lastHost[512];                // Store the last URL to a webstream

"http://stream.1a-webradio.de/deutsch/mp3-128/vtuner-1a" works now
redirect to new host "http://saw-stream20.radiohost.de/saw-deutsch_128?ref=vtuner-1a&amsparams=vtuner-1a&listenerrmid=78da05c1411283200c05d0bbb09684af965aaf625c60c98c5d601d8c7a7ddf9b10fb30c4883e36ee0302e8dd125ec1356e35db4761e1c3aaa64248fed6a5a6fcfb5356e1aca71ddf55b8ec9d473b085f766e5a3d929b1f42b91a91"

faster string funcs