Use JetBrains Mono as the editor's default code font

Created by: Calinou

This recently released font has been gaining popularity thanks to its readability and aesthetics. It also features ligatures which will be usable once Godot features text shaping support.

Its character set isn't as extensive as Hack's, but it should be sufficient for most uses.

More information at https://www.jetbrains.com/lp/mono/.

The default line spacing was decreased by 1 pixel to account for the different font metrics. The effective line height is the same as it was before.

This also reorders the third-party font notices to be in alphabetical order.

Preview

Before

After