Webaccess: fixed Cue list play/stop sequence working only once
InputOutputManager: speed up universes refresh

SPI: do not send data if there is none
Improved some debug messages
Show Manager: fixed common speed mode for Sequence steps

Show Manager: it is no more necessary to create a Scene to add audio tracks
Show Manager: improved import of existing Functions
Show Manager: highlight the clicked step
Removed SceneSelection class
Updated Show Manager documentation
Updated translations
Chaser Editor: Sequences in Function Manager can have Run Order and Direction

Improved Chaser Editor documentation
Show Manager: avoid a startup glitch
Engine: Fixed Chaser backward direction and ChaserRunner unit test
Updates to the Spanish Translation