Make length of QSHistory editable

[pjrobertson]

Nothing much here. I realised the QSHistory preset in the catalog (Catalog > Quicksilver > Recent Objects) is limited to 50. That's not enough for me.

I made it a hidden preferences to allow you to edit this value (ideally it'd be a setting in the Catalog UI but I don't have the time for this :(

[skurfer]

OK, but I say we get rid of MAXHIST entirely and set the default in QSDefaults.plist, since that’s the standard way we handle such things.

[tiennou]

And I say "add it to the Advanced prefs" 😉. IIRC it's just about a few lines in a plist (if it supports integer values).

[skurfer]

I did the things. 🆒

[pjrobertson]

Looks good. Can I merge a PR that I started? I say yes! :D

[skurfer]

Yup.

[skurfer]

Of course I just noticed this, but you can’t actually change the number in Extras. You can see what it is, though! 😁

[tiennou]

Gosh, I wonder whose fault it is 😁.

I was pretty sure it was working… Oh well, at least it's somewhat auto-documenting.

[pjrobertson]

😨 Ooops!

I think we should try and do away with the 'Extras' tab in the future anyway. It's not very self-explanatory, and some of the prefs should maybe even be deleted. Another job for another day :P