sugest: replace 'sample-track' with (fi) AFP in Default-project

current Sample-Track (s-t) generator is not very usefull/good. I think its kind of a 'shame' to have one of the least functional features, as a default, in every new project a user creates. Woulden it be better if (f.i.) an AFP or perhaps zasfx was replaced with s-t, in the default configuration? ..in a way 'hide' s-t a little, instead of letting it bask in default-project :p
(Cause everyone can make their own default setup as template, but that a different story, and not really connected to the first impression of lmms)
When the improved s-t is ready, it will also get the attention it deserves, if it apear more like _Hey i'm the new amazing default!_

Inspect the Default-project configuration and identify where the Sample-Track generator and candidate AFP or zasfx components are selected. Compare the available defaults and confirm which replacement is intended; the work is done when the agreed component is used in new projects instead of Sample-Track.

Written by the indexing model from the issue text.