Improvements on delay input

[cpvalente]

We are looking for some improvements on how we enter delays

• Ability to have negative delays (time ahead)
• Could we have a nicer workflow for adding delays? Roll back to slider from the earlier versions?
• Show a more self explanatory note field as suggested in Component improvements in event block #55 (15 minutes delayed - 15 minutes ahead)
• Show somewhere the running time compared to local (1:25min behind)

[je71175]

Yes to negative values
I like the + - 1 and + - 5 minute buttons on the timer control. Same could be used for quickly setting a delay value!

[cpvalente]

Some of these were released as part of #96.
Adding a slider for time input didnt pass user tests.

Delay usage should probably be restructured with the timekeeping, this is something that i will be looking at separately together with some roll mode improvements and potentially a mode for continuous playback

Most importantly: negative delays are a go.