Compile-time hexadecimal RGB and RGBA color literals.
~RGB accepts three or six hexadecimal digits. ~RGBA accepts four or
eight hexadecimal digits. Short literals expand each digit, so ~RGB"abc"
is equivalent to {:rgb, 0xAABBCC}.
These sigils deliberately omit a leading # because their names already
identify the literal as a hexadecimal color.
Summary
Functions
Builds an opaque RGB literal from three or six hexadecimal digits.
Builds an RGBA literal from four or eight hexadecimal digits.