Add main menu item to search for book in library menu by string

[pachpict]

Use external keyboard (Console or another external keyboard).
Not case sensitive. Treats spaces/dashes/underscores as interchangable (as we don't show the last two in the UI, we treat them as spaces).
Interface not dissimilar to "Go to page" menu but instead, once string is entered, it takes the user to the library menu, open on the results that show the first positive return. User pressing prev or forward keys takes them to the next positive result, not the next normal library page.