Ignore leading "The"

[rafi]

Add ignore_leading_the setting to ignore leading "The" word while sorting items in library.

Currently all the entries with "The" are grouped together alphabetically under "T", which makes it hard to intuitively search by artist name, e.g.:

[GeReV]

Hey, thanks for pitching in! I'll try to get back to this project soon, haven't touched it for a while.

If you'd like to join in, I would love the help!