Fixed SD card error, issue 1610

Closes #1610 

This one should also be ported to master (2.0.9) an frsky branches.

Short description of changes:
* sport.log now only produced with `SPORT_FILE_LOG=YES` make parameter
* added Event Trace Buffer ( `TRACE_SD_CARD = YES` for SD card tracing, `TRACE_FATFS = YES` for FatFs tracing). When Trace Buffer is not enabled it should not affect source code in any way.
* fixed SD card errors:
  * added spi_reset()
  * wait for op to 100ms for Data Response in xmit_datablock()
  * mixerTask sleep changed from 2ms to 4ms
* spell-checked Makefile