* (done) Moving AB sliders does not set AB limit. Instead need to save AB limit and then select it to apply
* (done) Loading session is additive, should clear the state first
* AB limits are displayed as p.u., should be timestamps
    * Named limits would also be acceptable e.g. first solo, second solo, etc
* (done) Songs are displayed as full path, should be file name or ideally title from metadata
* (done) When switching between songs, AB limit selection is not reset, this means that if the song has only one limit, it is not possible to load it anymore
* (done) No GUI to control playback speed