Add ColorIndexForNumber macro replacing '& 0x07'

Makes it easier to add more colors.

code/client/cl_console.c

@@ -583,8 +583,8 @@ void Con_DrawNotify (void)
 			if ( ( text[x] & 0xff ) == ' ' ) {
 				continue;
 			}
-			if ( ( (text[x]>>8)&7 ) != currentColor ) {
-				currentColor = (text[x]>>8)&7;
+			if ( ColorIndexForNumber( text[x]>>8 ) != currentColor ) {
+				currentColor = ColorIndexForNumber( text[x]>>8 );
 				re.SetColor( g_color_table[currentColor] );
 			}
 			SCR_DrawSmallChar( cl_conXOffset->integer + con.xadjust + (x+1)*SMALLCHAR_WIDTH, v, text[x] & 0xff );