Merge in SDLP modifications#2

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jholtom wants to merge 2 commits intomasterfrom

Commits on Jul 31, 2018

modified the creation of the transfer frames so that the solution was more elegant and correct, filling an incomplete transfer frame with packets of the idle data, rather than just stuffing it with…
jevanjones
committed

Commits on Aug 1, 2018

included sx1212.h into the sdlp header file
jevanjones
committed