Better Vibrato Controls

Nobody has claimed this yet.

### Enhancement Summary

LMMS has to be my current favourite DAW software, but it does have a few... problems that I would like to be fixed.
The biggest issue for me is the _Vibrato control_, which it severely lacks. As someone who really likes vibrato in his tracks/music, I would really like it if LMMS had any sort of good vibrato control, since the only ways currently to use vibrato are Vibrato effects (affects the whole track unfortunately) and rapid pitch bends (needlessly complex).

### Implementation Details / Mockup

Maybe a better separate vibrato plugin, or a mod channel track to help control multiple tracks from one handy channel or plugin with multiple effects, akin to UltraBox. I think, even if the bare minimum for vibrato was added, it should at least be able to be easily switched on and off, so a sound can ease into a vibrato effect which can easily switch off for the next note.
Adding a feature for vibrato to affect reverb would also be nice.

### Please search the issue tracker for existing feature requests before submitting your own.

- [x] I have searched all existing issues and confirmed that this is not a duplicate.

No file, test, or entry point is named. Begin by locating the existing Vibrato effects and rapid pitch-bend paths, then compare the proposed separate vibrato plugin and mod channel track options. Done is not defined beyond easily switching vibrato on and off, with reverb interaction suggested as an additional option.

Written by the indexing model from the issue text.