class NoAnsi is missing override methods

NoAnsi has
```
public Ansi fg(Color color) {return this;}
```
but not
```
public Ansi fgRgb(int color){return this;}
```
which means when ```Ansi.setEnabled(false)``` and e.g. ```println(ansi().fgRgb(0x808080).a(x).reset()```  escape sequences are still output
