Changes by PaulZC

[PaulZC]

Hi @unsurv,
Thanks again for submitting your PR sparkfun#116. It was good but needed a few corrections. If you merge this PR into your master branch, we can then get PR sparkfun#116 merged into the main SparkFun master branch.
The changes are:

• Added definitions for the four wakeupSources pins so they can be or'd together if necessary
• Changed wakeupPin (uint8_t) to wakeupSources (uint32_t) in powerOffWithInterrupt
• Changed the spaces to tabs in keywords.txt
• Added payloadCfg[4-7] to powerOff. It is important that these get set correctly.
• Added payloadCfg[1-3] to powerOffWithInterrupt. It is important these are set to zero and not left undefined.
• Corrected the order of payloadCfg[8-11] in powerOffWithInterrupt. These were big endian but need to be little endian.
• Corrected the value for payloadCfg[8] when forceWhileUSB is true (needs to be 0x06 not 0x04).
• Set payloadCfg[12-15] in powerOffWithInterrupt according to wakeupSources.
  All the best,
  Paul

[unsurv]

Thanks for fixing these.