Draw Braille characters instead of using font

Unicode braille characters are used to draw text mode graphics in higher resolutions than other block characters (4x2 per character cell). E.g. drawille, btop.

With this MR, Konsole renders those characters using drawing primitives rather than the current font, similar to other line and block characters.

This option is configurable in the profile, similar to line and block drawing characters. Braille characters are drawn directly (rather than using the current font) only when line and block characters are.

Unlike line and block characters, Braille defaults to using font, since they have uses other than drawing textual graphics (such as reading Braille texts).

btop with:

btop without:

drawille with:

drawille without: