The Trait
enum is used within Brush objects to alter the appearance of Glyphs
on screen.
Not all Traits are supported by all terminals.
There are 8 Traits:
Bold
Italic
Underline
Standout
Dim
Inverse
Invisible
Blink
These can be applied to a Brush with the Brush::add_traits(Trait...)
method,
this will take any number of Traits and apply them to the Brush.