HLT1 track reconstruction with seeding & matching algorithms

Clean up version of long track reconstruction based on SciFi seeding and Velo-SciFi matching (!742 (merged)).

The hlt1 reconstruction with seeding+track-matching can be enabled by using the hlt1_pp_matching or hlt1_pp_matching_validation sequences.

Information about the new tracking algorithms and the existing discussion can be found in !742 (merged) (which will be kept as a development branch).

@lohenry @lcalefic @ahennequ @bjashal @lpica @gligorov @dcampora @dovombru

added RTA new feature labels

requested review from @dcampora

assigned to @lohenry and @cagapopo

Can you please:

• close this MR.
• reopen the other MR.
• git push force this branch onto the branch of the other MR.

That way, we keep the message history.

mentioned in issue Moore#454 (closed)

closed