This change joins the fg/bg/attr methods into a single hl method in the
renderers. This provides the same functionality, and it simplifies the
terminal rendering by being able to join all the attributes into one
escape sequence.
It's also a necessary change for the vim renderer, as this renderer
needs to log all the highlighting and create separate highlighting
classes for every single color and attribute combination. The only way
to do this is to have a single highlighting method.
This is currently rendered with the terminal renderer, and is just
a simple proof-of-concept of how vim statuslines can be defined with the
Python API.
Kim Silkebækken