3.0 API removals

[stsrki]

• Remove obsolete CardImage.Alt; use CardImage.Text.
• Remove obsolete FigureImage.AlternateText; use FigureImage.Text.
• Remove obsolete Cropper.Alt; use Cropper.Text.
• Remove obsolete QRCode.Alt; use QRCode.Text.
• Remove JustifyContent from the Field component. Along with all the FieldJustifyContent methods from class providers.
• Remove obsolete ToggleIconVisible; use ShowToggleIcon. On DropdownToggle and BarDropdownToggle.