Add context menu options to restrict the minimum and maximum value of FX parameters in OSARA's FX Parameters dialog.

[jcsteh]

Fixes #1195.

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[jcsteh]

This pull request courtesy of a 35 minute Uber ride in which I had nothing to do. :)

@HenriNH6, @Drizzell, can you try the build linked in #1212 (comment) and let me know if this works for you in practice?

[HenriNH6]

Hi @jcsteh,
Sorry it took me a while to test this. I've talked about it with @Drizzell too, and we're really happy with how the feature works - it's awesome!
I just had one small suggestion: Would it be possible to keep the lower and upper limits of a parameter active, even after closing the plugin window (like pressing Escape) or switching to another parameter in the same plugin? Right now, the limits reset when I do either of those things. It would be great if the limits stayed until I manually clear them from the context menu.
Even so, we are both very grateful for this feature, and we're really happy that OSARA has it.
Thanks a lot for all your work on this feature - it's super useful!

[ScottChesworth]

If these settings persist, we would need a way of notifying when a parameter has been range restricted.

[jcsteh]

Remembering the restrictions across invocations is tricky in terms of both user experience (the concern Scott flagged) and implementation (how to reliably store the limits associated to a particular parameter, etc.). It's not something I'm able to dig into right now, even assuming it's possible to make it reliable.