v0.5.0-rc.2020071301

• BREAKING: Remove 3rd param wf from WidgetPlaceholder.wrap
• BREAKING: Remove field HtmlWidget.tableCellPadding
• BREAKING: Remove class CssLineHeight
• BREAKING: Remove class ImageLayout (#230)
• BREAKING: Change param builder of TextStyleBuilders.enqueue
• BREAKING: Change method WidgetFactory.buildImage
• Add support for colspan / rowspan in table (#157)
• Add support for inline style text-overflow (#204)
• Add support for inline style sizing (#206): width, height, max-width, max-height, min-width and min-height
• Add support em/px in line-height and % in font-size (#220)
• Add support for svg src in IMG (#233)
• Bug fixes