More detailed parameterised scattering for no UT scenario

Andrii Usachov requested to merge add_endut_node_prkalman into master

Introduce reference EndUT node in PrKalmanFilter. This way the scattering transition is split into two in the case of no UT scenario. (also renames TT->UT in few places)

Aims to address #379 (closed) and observed mass peak shifts.

Needs LHCb!3969 (merged) Allen!1160 (merged)

Closes #379 (closed)

@oozcelik @dovombru @mveghel @gunther @pherrero

Edited by Andrii Usachov

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