Move CLICpix2 Decoder into Corryvreckan sources

Simon Spannagel requested to merge clicpix2_Decoder into master

This MR replicates the data decoder for CLICpix2 from Peary into Corryvreckan. This avoid the dependency to Peary and allows to more easily deploy Corryvreckan.

Since I had to adapt the decoder to match the strict compiler warning rules enables in this repository, its functionality should be tested with at least one TOT+CNT and one TOT+TOA mode run.

@williamm could you test this?

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