- Added `M.get_mode_suffix()` in `highlight.lua` to simplify retrieving the mode suffix.
- Fixed graphical bug occurring when `buffers` component color was changed.
- Separators would not change to new color.
- Fixed by adding the mode suffix to the highlight name
in `M.component_format_highlight` if the output of
`highlight.fn()` is a string.
- Added `use_mode_colors` option to `buffers`, `tabs`, and `windows` components.
- If it's set to true, the component's colors will change with the
mode, as most other components do.
- Updated readme.
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