Analyze widget markups for Custom Properties compatibility

• Type: Spike
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: None
• Component/s: Liferay Themes
• Labels: None
• Spike Type: Technical
• Epic Link: fi-saas-ui-extensions
• Sprint: S03E17 - Llanes, S03E18 - Córdoba

In IFI-1322 - Define variables to make a significant design change in content pages and widget pages we worked out a set of variables that allow signifcant style changes in Content Pages.

However, in there we also realized that Widget Pages don't really respond to them. 

The goal of this spike is to analyze Widget Pages and discover what's missing for them to be able to work well with our Custom Properties variables.

Acceptance Criteria:

• A document with a list of necessary changes in Widgets to adapt to the defined set of variables in https://issues.liferay.com/browse/IFI-1322