- document style bits in 16, 32 and 64-bit style models
- add `color_y(QEColor)` to compute the weighted light value
- publish `color_dist()`
- add `colors_init()` to initialize color support structures
- improve list of named colors:
* use CSS color names
* add X11 color names
* make grey a generic synonym for gray
- improve `qe_color_map` using ramp lookup arrays
- fix `qe_unmap_color()` bug on 4K color cube
- add custom palette to store extra named user defined colors
- improve `css_lookup_color()` and `css_get_color()`
- enumerate palette entries on `p` and `#`
- improve color scripts in `tests/`
- add `tests/getpalette.sh` to dump the current terminal palette colors
- add `tests/term-palette.sh` to compare palette colors and rgb colors
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