Attempts to set color according to a 24 bit value (r, g, b, each >= 0 and < 256).
true if it believes it was successful (note that it cannot be completely sure), false if it had to use a fallback.
This is not supported on all terminals. It will attempt to fall back to a 256-color or 8-color palette in those cases automatically.
See Implementation
Attempts to set color according to a 24 bit value (r, g, b, each >= 0 and < 256).