This reverts commits 8884b8f519bd5c8f2aa0
and 5cb31f6d5b.
<reduz> Akien, I understand the need for the second loop mode, but I think
the current UI is pretty confusing. I think this should be changed for an
enum, both there and in the animation.. otherwise we should revert it
[...]
<reduz> alternatively this could be added per track, which I think should
make it a little less confusing
Reopens #959..
