[Enhancement] Add search box to custom horns

[Megas97]

Few years ago when there were around 100 or 200 horns it wasn't a big deal to scroll through and find the one you're looking for but seeing how now there are almost 500 horns and anyone can upload their own, I think a search box would be a great thing to have. Maybe someone told you the name of the horn they're using and you like it, it's quite bad to have to scroll through the entire list just to find it. If the search box is empty, it would show the entire list as is right now but if you start typing something it would show only those horns which have the inputted text or part of it in their names.