[Cin] New native Tracer plugin checked into GIT

[Andrea paz]

> Kdenlive, for example, looks much better from the surface
> (the video and vector scopes lokk great), but is by far not as far
> advanced as Cinelerra. Nevertheless, they have a larger fan base because
> it is more modern and easier to use.

An idea about the GUI could be the option to make the edges of the
various windows magnetic and variable. Changing the size of a border
automatically changes the size of the neighboring windows as well.
That's how Premiere Pro works:
https://www.youtube.com/watch?v=C-u_R_2tkP4  (1:05 - 1:20)