Add Black (OLED) editor theme preset

This preset uses a fully black background to reduce power usage on OLED
displays, leading to increased battery life on laptops with OLED displays.

This preset is also useful for late night sessions, as OLED displays
have a near-infinite contrast ratio.

This also adds a Draw Extra Borders editor setting which draws borders
around some interactive nodes. This setting is required for good
usability of a theme with a fully black background.

Visibility of disabled text (including unselected tab names) has been
slightly increased for better accessibility, regardless of the editor
theme preset in use.

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