Merge pull request #876 from pwpiwi/fix_iclass_reader

fix 'hf iclass reader'
* code deduplication. Use functions from iso15693.c
* speedup CodeIso15693AsReader()
* invert reader command coding. 0 now means 'unmodulated' ( = field on)
* decode SOF only as a valid tag response in Handle15693SamplesFromTag()
* complete decoding of EOF in Handle15693SamplesFromTag()
* determine and write correct times to trace
* FPGA-change: generate shorter frame signal to allow proper sync in StartCountSspClk()
* modify StartCountSspClk() for 16bit SSC transfers
* whitespace in util.c
* add specific LogTrace_ISO15693() with scaled down duration. Modify cmdhflist.c accordingly.
* allow 'hf 15 raw' with single byte commands
* check for buffer overflow, card timeout and single SOF in 'hf 15 raw'
* decode and handle SOF only responses in Handle14443bSamplesDemod()
* allow 1 byte commands with 'hf 14b raw'
* don't do READCHECK when not trying to authenticate
* standard LED handling
* remove unused FLAG_ICLASS_READER_ONLY_ONCE and FLAG_ICLASS_READER_ONE_TRY
* sanity check for negative times in TransmitTo15693Tag()
* increase reader timeout for 'hf 15' functions to be enough for slot 7 answers to ACTALL
* add 'hf iclass permute' inspired by RRG repository
* whitespace in cmdhficlass.c