Added class member cc1101::setBitRateTolerance with new error code -109 in typeDef.h

[OlliLausS]

Changes in CC1101.cpp, CC1101.h and TypeDef.h

Function added to set Bitrate Tolerance in BSCFG register of CC1101
Added class member CC1101::setBitRateTolerance as proposed from jgromes after discussion.

Added new Error code "RADIOLIB_ERR_INVALID_BIT_RATE_TOLERANCE_VALUE" with value -109 to TypeDef.h

Tested with ESP32 and PlatformIO Environment.
Could not test on other platforms.

[jgromes]

Thank you for the contribution! It looks like cppcheck is reporting one minor issue, which is with the RADIOLIB_CHECK_RANGE macro being used. Since the value of brt can never be negative, you can replace the macro with just a simple if(brt >= 0x03), that should get rid of that problem.