Improvements for debugging GPIO conflicts. HTML UI integration still pending.
* pinManager can be asked for pin owner (String) and pin special purpose (string).
* wled.cpp: show GPIO allocation when compiling with WLED_DEBUG
* pinmanager: show Pin Owner as name when possible.
The results looks like this
GPIO | Assigned to | Info
--------|-----------------------|------------
i/o 0 Button
i/o 1 debug Serial TX
i/o 2 DMX out
i/o 3 ./. Serial RX
i/o 5 ./. SPI SS
i/o 15 AudioReactive (UM)
i/o 16 LEDs (digital)
i/o 17 Relay
i/o 18 ./. SPI CLK
i/o 19 IR Receiver SPI MISO
i/o 21 I2C I2C SDA
i/o 22 I2C I2C SCL
i/o 23 ./. SPI MOSI
i/o 32 AudioReactive (UM)
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