The pose mode 'Select Grouped' operator can now select by bone color.
This compares either the theme palette index, or the full custom color.
In other words, if custom colors are visually very similar but binary
not equal, they will be treated as different.
The last bytes of the custom colors (so `solid[3]`, `active[3]`, and
`selected[3]`) aren't used for these comparisons, as the values are
inconsistently either 0 or 255 depending on how the color was set. There
is no way to influence this with the color picker in the GUI, and AFAIK
the alpha channel isn't used for drawing either.
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