* cppcheck: make some params const
* transceiveCommand: restore state of SS in case of an error 

* Add code to allow authentication with Mifare Classic cards, thanks to @golyalpha !
* Unify and simplify command creation
* Smaller memory footprint if reading UID only (save ~500 Bytes)
* Refactor SPI transaction into transceiveCommand()

* readMultipleBlock(), getInventoryMultiple() and getInventoryPoll() has been implemented, thanks to @laplacier !
* multiple ISO-15693 tags can be read at once, thanks to @laplacier ! 
* fixed some bugs and warnings with c++17

* allow to instantiate with custom SPI class, thanks to  @mwick83!

* avoid endless loop in reset()

* Revert previous changes, SPI class was copied and caused problems
* Speedup reading (shorter delays) in reset/transceive commands
* better initialization for ISO-14443 cards, see https://www.nxp.com.cn/docs/en/application-note/AN12650.pdf

* allow to setup with other SPIClass than default SPI, thanks to @tyllmoritz !

* fix compiler warnings for platform.io
* add LPCD (low power card detection) example for ESP-32 (with deep sleep tp save battery power)

Version 1.5 - 07.12.2020

* ISO-14443 protocol, basic support for Mifaire cards
* Low power card detection
* handle transceiveCommand timeout

* ICODE SLIX2 specific commands, see https://www.nxp.com/docs/en/data-sheet/SL2S2602.pdf
* Example usage, currently outcommented

* Initialized Reset pin with HIGH
* Made readBuffer static
* Typo fixes
* Data type corrections for length parameters

* Cleared Option bit in PN5180ISO15693::readSingleBlock and ::writeSingleBlock

* Cleanup, bug fixing, refactoring
* Automatic check for Arduino vs. ESP-32 platform via compiler switches
* Added open pull requests
* Working on documentation

* Initial versions