Adding border gap

[amkherad]

Adding simple border gap. (Have effects on image size by resizing image to fit gap)

[hdodenhof]

Thanks for your contribution @amkherad! While I see use cases for this, I would still consider this an edge case. Implementing it would increase complexity and also create questions due to some dependencies (e.g. should a circleBackgroundColor, if set, also be affected by the gap?). As there also is a simple workaround, I won't merge this for now. Thanks again though!