IWidgetLink improvements

[GuidoZam]

Q	A
Bug fix?	[ ]
New feature?	[x]
New sample?	[ ]

What's in this Pull Request?

Added new properties to the IWidgetLink interface to allow more customization options. The new properties are:

• title: to enable the change of the default text of the link.
• color: custom color, if not specified the "brand" one will be used.
• target: specify an alternative target property for the generated anchor tag, the default remains _blank.