canvas.go
func PutChar(x, y int, r rune) bool {
	if InClipRect(x, y) {
		term.SetCell(x, y, r, canvas.textColor, canvas.backColor)
		return true
	}

	return false
}
func PutChar(x, y int, r rune) bool {
	if InClipRect(x, y) {
		term.SetCell(x, y, r, canvas.textColor, canvas.backColor)
		return true
	}

	return false
}
// PutChar sets value for the Canvas cell: rune and its colors. Returns result of
// operation: e.g, if the symbol position is outside Canvas the operation fails
// and the function returns false