[FEATURE] SelectableHtml custom render and image tap

[gusterwoei]

Describe your feature request
Original Html has properties customRender and onImageTap which are great for customization, but it's missing in SelectableHtml at the moment. Would be good to have it as well.

[erickok]

SelectableHtml can not show any images for the moment so onImageTap is not useful. Custom renders for SelectableHtml are added in #632 (which is not yet merged).