Enable LADSPA plugins on MSVC

[Rossmaxx]

Succeeds #6758, which I messed up after a force push. Luckily, I had an almost identical branch so just merged that branch in.

[tresf]

@tresf is doubtful about the veal changes.

I've only asked for basic regression testing. :). If you guys want to yolo it, go ahead. I'm far too busy to help with this portion right now. 🍻

[Rossmaxx]

I've only asked for basic regression testing.

I don't really know what to test for over there and I'm busy with college myself. If anyone would like to volunteer, please go ahead.

[Rossmaxx]

@DomClark what happened with the CI?

[DomClark]

The CI problem was a temporary Chocolatey outage. I reran the affected jobs.

[tresf]

Are we ready to merge this?

@tresf is doubtful about the veal (Calf LADSPA) changes. Though everything else is done, other than one comment by @Veratil which can be done in a follow up pr.

Sorry for the delay. I've had some time to review the veal changes. They seem to fall into 5 categories:

• UI changes
• MSVC-compat
• New features
• Minor bug fixes/guards
• Refactors

The only significant change was a refactor to orfanidis_eq.h, which seems to have encountered a very large refractor. At a glance, it should only affect the 5, 8, 12, 30 band EQs that Calf ships, and that's only assuming a mistake was made while refactoring.

I think the veal stuff is safe to merge.

[Rossmaxx]

I think the veal stuff is safe to merge.

Can we merge #6771 then?

[tresf]

I think the veal stuff is safe to merge.

Can we merge #6771 then?

Done.

[messmerd]

LGTM though I haven't tested it

[dan-giddins]

Nice one everyone 🎉