BarChart customization and ASCII support.

[Charanor]

Looking at the source code BarChart overrides its ProgressBar's AsciiBar property with a non-ASCII character: █. I suggest keeping it as ProgressBar's default (-) and also adding support to BarChart to change the bar character:

// Override all bars
new BarChart().Bar('+');
// Override bars separately
new BarChart().Bar(unicodeBar: '█', asciiBar: '+');

[patriksvensson]

The █ is part of extended ASCII (219) and part of most code pages, so it should be fine.

[Charanor]

The █ is part of extended ASCII (219) and part of most code pages, so it should be fine.

I'm using Spectre.Console on a Telnet server (for a MUD) to send pretty text and there are clients that can only handle 7-bit ASCII so unfortunately not for my use case 😅