[libdfm] Support AST formatted configuration

[Dadie]

Currently aside from padding no configuration is available for the formatted dfm output of the ast.

The following options should be available:

• Column limit (n, default:120)
• Use tabs (yes, no, default: no)
• Tab width (n, default: 8)
• Indent width (n, default: 2)
• Empty inline objects in one line (yes, no, default: no)
• Binary string column limit (n, default: 64)
• Escape non ASCII characters (yes, no, default: yes)
• Space before trailing comment (yes, no, default: yes)
• Reflow comments (yes, no, default: no)
• Break before braces (yes, no, default: no)
• Break before comma (yes, no, default: no)
• Break after braces (yes, no, default: yes)
• Break after comma (yes, no, default: no)
• Align assigns (left, right, none, default: none)
• Newline (cr, lf, crlf, preserve, default: preserve)