Timelines update teaser

I’ve been working on a big overhaul of the timelines editor!

Now the visualization of message timestamps and values I think is much more intuitive.

It’s also much clearer that the “Current” lane contains discreet messages while the “Offset” one can have interpolated values.

This comes with full multiple-selection editing, and precision editing of values if needed.
I’ve spent a lot of effort to not restrict the full capabilities of OSC - so TWO’s timelines still fully support messages with any set of mixed types, with all kinds of value ranges.

The bulk of the work is done, now for the details and cleanup!