Highlights for application release notes

Python configuration framework (PyConf) and general application configuration

Algorithms used for filtering in the control flow (scalers, GECs, TOS filters, PrFilter, etc.)

Jet reconstruction

A MR with this label is blocked by another that goes together with it but is still WIP

A merge request with this label is picked up in the lhcb-lcg-test nightly slot.

A merge request with this label is picked up in the lhcb-lcg-dev4 nightly slot.

A merge request with this label is picked up in the lhcb-lcg-dev3 nightly slot.

A merge request with this label is picked up in all nightly builds building the target branch.

Merge request on legacy branches

A merge request with this label is picked up in the lhcb-new-cmake nightly slot.

A merge request with this label is picked up in the lhcb-run2-patches-dev4 nightly slot.

A merge request with this label is picked up in the lhcb-run2-patches nightly slot.

A merge request with this label is picked up in the lhcb-head-2 nightly slot.

Automatic throughput test shows decrease in HLT2 throughput