setCell method
Sets a single cell at (x, y) using alpha blending.
attributes must fit an unsigned 32-bit value; a violation throws a
pre-invocation RangeError after the lifecycle, character, and bounds
checks.
Implementation
void setCell(int x, int y, String char, Color fg, Color bg, int attributes) {
setCellWithAlphaBlending(x, y, char, fg, bg, attributes);
}