Unicode Full-Width Characters
Incorrect position of VertLine caused by writing Unicode Full-Width Characters
<pre>
tb.drawRect(0, 0, 40, 5)
tb.write(2, 1, fgWhite, "您好!")
┌───────────────────────────────────────┐                                                                                                                           
│ 您好!                                   │                                                                                                                           
│ Press ESC or Q to quit                │                                                                                                                           
│ ═════════════════════════════════════ │                                                                                                                           
│                                       │                                                                                                                           
└───────────────────────────────────────┘ 
</pre>