Sequence search track doesn't work on embedded

[cmdcolin]

The dialog to start a sequence search uses session.addTrackConf which is not available on embedded

It might be good to just add session tracks to embedded perhaps, but could also detect if session.addTrackConf available before adding it

[cmdcolin]

Some discussion at meeting suggested that users might not want session tracks/added tracks. Therefore, could make sequence searching track option hidden if session.addTrackConf unavailable, but also consider adding session.addTrackConf to embedded too