Introduce ExternalLink control

[jarolrod]

Control to handle storing and opening of external links. Can be just text or icon, or combination. To be tested with #143

[shaavan]

Concept ACK

Keeping #143 in mind, porting the code related to creating an external link to separate files makes sense for the following reasons:

1. This will allows the component to be used separately from the Settings.qml component.
2. This will allow link-related code to be easily maintainable and also more intuitive to use compared to the current implementation.

[jarolrod]

Updated from 419bd21 to b700fc6 (pr141.01 -> pr141.02, diff)

changes:

• make link a required property.
• remove uncessary and redundant layout formatting declarations.
• remove wordwrap, this was a part of the implementaion in information.qml but this is not needed at all according to the design specs, if anything a follow-up can add eliding instead. Removing word-wrap eliminates the formatting issue with long url descriptions seen in Extend settings component #143.
• Refactor the component holding the icon from Image to Button.
  • we want the icon to be represented by the Icon type because the icon will actually appear sharper on screen, and because we can't colorize an Image without QtGraphicalEffects. If we added support now for QtGraphicalEffects it is endlessly more complex to colorize an Image than an Icon.
• properly colorize text and icon to the design file specifications
• fixed indentation
• edit commit message to reflect that this is introducing a control and not a component.

[jarolrod]

updated from b700fc6 to 7d1d977 (pr141.02 -> pr141.03, diff)

changes: handle undefined state of description and iconSource by setting it as an empty string

[jarolrod]

updated from 7d1d977 to aadee41 (pr141.03 -> pr141.04, diff)

Changes: make spacing in the RowLayout 0, as the design spec specifies no spacing between the link description and the icon box.

[hebasto]

ACK aadee41, tested on Ubuntu 22.04.