Added Frequency and Participant ID config parameters#4

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mfanourakis wants to merge 3 commits intolabstreaminglayer:masterfrom

mfanourakis:master

Commits on Sep 2, 2020

added frequency selection and participant id option
Marios Fanourakis
committed
fixed some config formatting
Marios Fanourakis
committed

Commits on Oct 7, 2020

changed gaze point validity check to be inline (more consistent with the other data)
Marios Fanourakis
committed