Support delight
- [Feature] Fix #202: Be compatible with delight.
- [Feature] Fix #203: Add custom faces for the LSP icon.
- Remove the advice of fill-paragraph.
- Optimize: faster to render icons.
- Fix #200: Helm mode line is mixedly active/inactive when previewing a line.
- Rename doom-modeline--default-mode-line to doom-modeline--old-format.
- Refactor.