Sort effects in dialog

[jasp00]

This fixes #2834.

[jasp00]

Entries are sorted by display name. Example:

Amplifier
LADSPA: 3 Band EQ
Multitap Echo

[tresf]

Can we abolish LADSPA and VST prefixes while we're at it? What worth does that have?

[DeRobyJ]

I think they are useful. It's just an opinion.
Having them lets you see what lmms sees in the vst folder, for example.

[mikobuntu]

I think the best way to approach this would be to have lists e.g Native , LADSPA , VST .
Why not even have these collapsible like in the browser dialogue?

[tresf]

If we like em, make the type a column in a sortable table. Alphabetically, they cause a problem.

In regards to grouping like the file browser, please no.

[grejppi]

Can we abolish LADSPA and VST prefixes while we're at it? What worth does that have?

FWIW #2616 will make them redundant with only an External prefix, which would be even less useful.

[jasp00]

Effects are now sorted with a sortable table.

[tresf]

@jasp00 at a glance, this seems to work well.

Pardon the screenshot, the font contrast will be filed as a separate issue.