sequential example chain

Sequential example

A first sequential example chain can be found as examples/seq_example.cpp. It reads in data produced with the ActsExamplessetup and itsCsvWriter/Reader` reader infrastructure.

The program flow is as follows:

- loop over events:
-- loop over modules:
     - run connect component labeling (ccl) per module 
     - run measurement (mc) creation on output sets of (ccl) per module
     - run spacepoint (sp) formation on output measuremetns of mc 
-- run seeing (not yet implemented)

TrackML Pixel detector

The data of the `trackml