Calc character width correct

[heroboy]

Should correctly calc the char width in console. Not simply using String.Length.

Consider this implement:

https://github.com/gui-cs/NStack/blob/92b5d7f56bad11a9ce637797d0c8c4a14d6f50c5/NStack/unicode/Rune.ColumnWidth.cs#L152

[frg2089]

Some characters are twice as wide as normal ASCII characters.

Even though we have ProgressBarOptions.MessageEncodingName to mitigate this.
But I think encoding length and character width are two different things.

[heroboy]

The current implementation is from #82
It is totally wrong. It can be a workaround to be used in a limited area. But it shouldn't be merged.