Tidy up Electron Trigger Sequence building

This is a MR related to ATR-24210 ATR-24211 and ATR-24213.

In this push I rewrote the sequence building function so its built out dynamically interpreting the chain parts available, instead of a dictionary with all possible combinations and a big set of "if then else" in the names to match the former.

Also, moving etch chains as in previous version where no precision tracking was run. So some changes in feature counts but no change in events accepted by some etch chains.

Pinging @jodafons @cjmeyer @dbakshig

edit: This should also fix/implement ATR-23723