eliminate vars: $setup->{latency_graph} $setup->{final_graph}
Use $g for this in future
rename lists of variables to be serialized
@persistent_untracked_vars -> @persistent_vars
@persistent_vars -> @tracked_vars
rename to json_out() calls to yaml_out() that had been previously redirected to json_out()
attempt to move rec_setup/cleanup triggers
reconfigure_engine()
However checking whether to trigger causes a reconfigure
fix user-defined commands broken in 0b34e96
protect against int() on undef
Boost track is MasteringTrack (was SlaveTrack following Master)
new key: $setup->{_old_rec_status}
convert old projects Boost track class to MasteringTrack
status_snapshot(): snapshot only non-OFF tracks
finalize rec setup/cleanup hooks
new class BoostTrack fixes Boost track rec_status behavior