Simultaneously support both fixed advanced width and Proportional/Zero width

[prasannagunuru]

To provide some context, we have a substantial collection of SVGs, totaling nearly 3000+. The majority of these SVGs are sized at 36x36 pixels. Additionally, there are specific SVGs used for parent and children emojis in family combinations, which are sized at 16x36 pixels and 0x36 pixels, respectively.

The desired output font is expected to have a consistent width of 2612 for all 36x36 pixel inputs, while ensuring that the parent and children glyphs have proportional and zero width as required.

[rsheeter]

Would it be possible to provide examples, perhaps replacing the actual shapes with boxes if it is undesirable to open source the actual artwork?

[prasannagunuru]

Attached our sample input svgs. FYI, Last svg is zero width and not visible.

[prasannagunuru]

PR to resolve this issue